Tag Magnetic Particle

Every day, thousands of industrial structures, equipment, and components operate under severe conditions of pressure, temperature, and mechanical stress.

During manufacturing or throughout the lifespan of these materials, discontinuities can arise and, if not identified in time, can evolve into critical failures, directly impacting safety, operation, and industrial costs.

It is in this scenario that the Non-Destructive Testing (END) Inspector assumes an essential role.

Celebrated on March 27th, Non-Destructive Testing Inspector Day recognizes the importance of this professional who works on the front lines of failure prevention and industrial reliability.

What are Non-Destructive Tests (END)?

Non-Destructive Testing (END) methods are inspection methods used to evaluate materials, components, and structures without causing damage to the parts being analyzed.

These techniques allow for the identification of surface and subsurface discontinuities that can compromise structural integrity, directly contributing to the operational safety and reliability of industrial processes.

They are widely used in activities such as:

• Manufacturing of industrial components
• Weld inspection
• Preventive and predictive maintenance
• Quality control
• Structural integrity assessment

By enabling the early detection of discontinuities, END prevents unexpected failures, reduces operating costs, and increases the safety of operations.

The role of the END Inspector in industrial reliability

The END inspector is the professional responsible for performing, evaluating, and recording the results of inspections carried out using these methods.

Their role requires technical knowledge, mastery of applicable standards, and an understanding of inspection procedures.

Among their main responsibilities are:

• Evaluate the condition of materials and components
• Identify relevant discontinuities
• Interpret indications obtained during inspection
• Record results with technical accuracy
• Ensure compliance with standards and specifications

More than just performing tests, the inspector is responsible for ensuring the reliability of the results, a crucial factor for industrial safety.

Main Non-Destructive Testing methods used in industry

Several methods comprise Non-Destructive Testing. Among the most widely used are Liquid Penetrant Testing (LP) and Magnetic Particle Testing (MP).

Penetrant Testing (PT)

Liquid penetrant testing is used to identify surface discontinuities in non-porous materials.

The method consists of applying a highly penetrating liquid to the surface of the part. After an appropriate interval, the excess is removed and a developer is applied, allowing the indications to be visualized.

It is widely used in the inspection of:

• welding
• machined parts
• cast components
• metallic and non-metallic surfaces

Magnetic Particle Testing (MPT)

Magnetic particle testing is applied to ferromagnetic materials and allows the identification of surface or near-surface discontinuities.

During the test, the part is magnetized and particles are applied. In the presence of discontinuities, magnetic flux leakage occurs, forming visible indications.

It is used in the inspection of:

• welds
• shafts
• gears
• structural components
• parts subjected to mechanical stress

A fast, efficient method that is widely used in the industry.

Qualification and technical responsibility in END testing

Non-destructive testing (END) is not limited to the execution of the method; it also involves the correct interpretation of the observed indications.

Therefore, inspections must follow specific technical standards and procedures defined for each application.

The acceptance criteria, parameters, and procedures are established according to applicable standards and internal procedures of each company, under the responsibility of professionals qualified in the method.

The reliability of the results depends directly on three factors:

• Qualification of professionals
• Correct application of methods
• Proper use of materials and equipment

The role of Non-Destructive Testing in industrial maintenance

Non-destructive testing plays a strategic role in preventive and predictive maintenance, allowing the monitoring of component condition throughout their service life.

With this, it is possible to:

• Plan interventions in advance
• Avoid unexpected failures
• Reduce operating costs
• Increase equipment reliability

Applications of Non-Destructive Testing in major industrial sectors

Non-destructive testing is fundamental in various industrial sectors, especially where structural integrity is critical.

Among the main sectors are:

• Oil and gas industry
• Aeronautical sector
• Automotive industry
• Power generation
• Metal construction
• Industrial maintenance

In these environments, inspection directly contributes to ensuring the integrity of equipment, structures, and operational systems.

The importance of Non-Destructive Testing for industrial safety

Non-destructive testing is an essential part of modern industry, contributing to process reliability and operational safety.

By identifying discontinuities before they develop into critical failures, these methods ensure greater control over the integrity of equipment and structures.

On this Non-Destructive Testing Inspector Day, we reinforce the importance of the professionals who work on the front lines of inspection, ensuring that technical standards and quality criteria are met in every evaluation performed.

Excellence in products for those seeking reliable results

Metal-Chek provides complete solutions for Non-Destructive Testing: penetrant liquids, removers, developers, lighting fixtures and accessories, developed according to the main ASTM, ISO, ASME, NM and PETROBRAS standards, guaranteeing quality, safety and technical compliance in every inspection.

Speak with our  technical consultants  and find the ideal solution for your process.

Visit our  blog  and check out other technical content.

Discover our complete product line.

Follow Metal-Chek on Instagram, Facebook , and LinkedIn.

Aviation is one of the most stringent industrial sectors when it comes to operational safety. Aircraft are designed to operate under severe conditions of load, vibration, pressure variations, and continuous cycles of structural fatigue over thousands of flight hours.

To ensure that all components maintain their structural integrity over time, the aeronautical industry relies heavily on Non-Destructive Testing (END) .

More than just a verification step, ENDs (Non-Destructive Tests) are part of aviation safety culture. From the manufacturing of structures and components to maintenance programs throughout the aircraft’s lifespan, thousands of inspections are carried out to identify potential discontinuities before they evolve into critical failures.

Every safe flight depends on a series of technical inspections that ensure the structural reliability of the aircraft.

Non-Destructive Testing in the Aeronautical Industry

Non-destructive testing methods are used to evaluate the integrity of materials and components without compromising their future use.

In the aeronautical industry, different methods are applied as required by the aircraft manufacturer’s manual. Among the methods used are:
ultrasound
, radiography
, eddy currents
, liquid penetrant testing
, and magnetic particles.

Each method has a specific function within the inspection programs applied in the manufacturing and maintenance of aircraft.

Among these methods, fluorescent penetrant testing and fluorescent magnetic particle testing are widely used for the detection of discontinuities.

Technical rigor and materials control in aviation

The aeronautical sector adopts extremely rigorous criteria for the products used in inspection processes.

For example, the penetrating materials used in these processes must be qualified in the QPL — Qualified Products List.

Only listed materials may be used in certain aircraft inspection processes, ensuring standardization, traceability, and reliability in the results obtained.

Fluorescent penetrant liquid in aircraft inspection

Fluorescent liquid penetrant testing is widely used in the aeronautical industry to identify extremely fine surface discontinuities.

The method is based on the phenomenon of capillarity, allowing the penetrant to penetrate cracks or discontinuities open to the surface. After removing the excess and applying the developer, the retained penetrant returns to the surface, forming indications observed under ultraviolet illumination.

For aeronautical applications, the penetrants, removers, emulsifiers, and developers used must be properly qualified according to the applicable QPL list.

Metal-Chek offers the Sherwin Dubl-Chek line in Brazil, consisting of penetrant testing systems developed to meet the technical requirements of the aeronautical sector.

Fluorescent magnetic particles in ferromagnetic components

Magnetic particle testing is used to inspect components made from ferromagnetic materials.

The method involves magnetizing the component. When there is a surface discontinuity or a discontinuity near the surface, a distortion occurs in the magnetic field, forming a leakage field that attracts the magnetic particles applied to the part.

In the aeronautical industry, the test is typically performed using fluorescent magnetic particles in an oil-based liquid suspension, which provides greater sensitivity in the formation of indications.

In the context of the Metal-Chek line, fluorescent magnetic particles can be used in the aeronautical sector when applied in oil-based suspension, using the Supermagna OMC 10 MMS vehicle .

This combination allows for the proper formation of the suspension for application of the method, in accordance with the technical requirements adopted in aeronautical inspections.

Inspections throughout the aircraft’s lifespan

Non-destructive testing inspections are not limited to aircraft manufacturing.
These methods are part of ongoing maintenance and structural monitoring programs. Throughout the aircraft’s lifespan, components are periodically inspected to identify potential discontinuities caused by:
• structural fatigue
• repetitive load cycles
• vibration
• thermal variations
• severe operating conditions

This continuous monitoring allows for the identification of potentially critical conditions before they evolve into structural failures.

Air safety built into every inspection

Modern aviation safety is the result of a combination of advanced engineering, rigorous procedures, and reliable inspections.

Non-destructive testing is an essential part of this system, allowing the structural integrity of components to be evaluated without compromising their use.

Each inspection performed represents another level of assurance in the integrity of the aircraft, directly contributing to the safety of passengers, crews, and air operations worldwide.

Excellence in products for those seeking reliable results

Metal-Chek provides complete solutions for Non-Destructive Testing, with products developed according to the main ASTM, ISO, ASME, NM and PETROBRAS standards.

Among its solutions are systems for liquid penetrant testing, magnetic particles, and various consumables used in industrial inspections, contributing to consistent results, operational safety, and technical reliability.

Speak with our  technical consultants  and find the ideal solution for your process.

Visit our  blog  and check out other technical content.

Discover our complete product line.

Follow Metal-Chek on Instagram, Facebook , and LinkedIn.

In an industrial setting, Quality Control is responsible for ensuring that products and processes meet established technical, regulatory, and contractual requirements.

Non-Destructive Testing (END) is an integral part of this Quality Control system. It consists of technical tools used to verify the integrity of materials and components without compromising their future use.

However, in many industrial environments, there is a disconnect between operations and the Quality or END departments.

On one side, those who execute.
On the other, those who inspect.

When this relationship is misunderstood, the perception arises that inspection exists only to point out flaws or interrupt the process. This view generates internal noise and weakens the quality culture.

Operation and END are not competitors. They operate at different stages of the same objective: ensuring the technical conformity and reliability of the final product .

The role of the operation in process integrity

Execution is the foundation of any industrial result.

It is the operational team that applies procedures, controls parameters, performs welding, assembly, and adjustments that determine the component’s performance.

Quality begins in the production process. When execution is consistent and aligned with technical requirements, inspection tends to confirm this conformity.

The operation, therefore, is not merely an executor; it is an active part of the quality control system.

The role of END in technical verification

Non-destructive testing serves to verify whether a product meets integrity criteria.

END does not create discontinuities.
It evaluates what is already present in the material or what is inherent to the manufacturing process.

When a relevant indication is identified, the objective is technical: to prevent an unsuitable condition from progressing in the process or reaching the customer.

Internal inspection reduces major risks, avoids external impacts, and preserves the integrity of the production system.

When conflict arises

Disagreements between operation and quality often arise when inspection is perceived as an obstacle to the pace of production.

However, a nonconformity identified internally represents an opportunity for controlled correction. Conversely, a failure detected externally can compromise contracts, schedules, reputation, and operational safety.

END acts as a validation step within the production flow, not as a barrier, but as a mechanism for technical verification.

When operations and END work as partners

Mature industrial environments exhibit clear characteristics:

• The operational team understands the acceptance criteria applicable to the process;
• The inspector understands the variables and limitations of the production process;
• There is objective technical communication;
• Adjustments are treated as process improvements, not as personal conflicts.

When integration exists:

✔ Rework decreases
✔ Process predictability increases
✔ Approval rate improves
✔ Trust between departments is strengthened

Inspection is now recognized as part of the quality workflow, and not as an impediment.

Quality culture: shared responsibility

Quality is not exclusive to the END sector.

It involves planning, execution, verification, and continuous improvement. When everyone understands their role within the system, the environment becomes more collaborative and technically consistent.

A strong quality culture reduces costs and improves performance indicators in a sustainable way.

Procedures and products as elements of stability

The partnership between operations and END also depends on a solid technical foundation:

• clear and well-defined procedures;
• objective acceptance criteria;
• Standardization of inspection methods;
• Reliable and consistent inspection products.

When parameters are clearly defined and the products used deliver consistent, specification-compliant performance, the process becomes more stable and technically reliable. Consistency in results strengthens trust between departments.

Operation and Non-Destructive Testing operate at different stages of the process, but share the same purpose: to ensure that the delivered product conforms to integrity requirements.

Overcoming the idea that the quality sector is merely a “pointer of errors” is essential to consolidating more mature, cooperative, and efficient industrial environments.

When execution and verification work in an integrated way, the result is a more stable, safe, and reliable production system.

Excellence in products for those seeking reliable results.

Metal-Chek provides complete solutions for Non-Destructive Testing, with products developed according to the main ASTM, ISO, ASME, NM and PETROBRAS standards, contributing to consistent and technically reliable inspections.

– Read more technical content about END on our blog
– Follow Metal-Chek on Instagram: @metalchek and on LinkedIn

Non-Destructive Testing (END) plays a fundamental role in industry. Far beyond a technical inspection step, END is a strategic tool that directly contributes to product quality , operational safety , cost reduction , and the preservation of life .

In an increasingly demanding industrial environment, where failures can result in accidents, unscheduled downtime, and significant financial losses, END (Non-Destructive Testing) acts preventively, allowing the identification of discontinuities before they evolve into critical failures. This control impacts the entire organization, from the purchasing department to senior management, strengthening the industry as a whole.

Non-Destructive Testing: More than inspection, an industrial strategy

Non-destructive testing comprises a set of inspection methods used to assess the integrity of materials, components, and structures without compromising their future use.

Methods such as Liquid Penetrant Testing (LP) , Magnetic Particle Testing (MP) , and Leak Detection are widely applied in manufacturing, maintenance, and operational inspections. They allow for the early identification of discontinuities, defects, or inadequate conditions, ensuring greater reliability in industrial processes. When correctly specified and executed, END ceases to be merely a regulatory requirement and becomes an instrument for quality and risk management .

Strengthening industry and preserving life

One of the main pillars of Non-Destructive Testing is safety. The integrity of equipment, structures, and components is directly related to the protection of people, the environment, and industrial assets.

Undetected defects can result in serious accidents, leaks, structural collapses, and operational interruptions. END (Non-Destructive Testing) acts preventively, significantly reducing these risks by identifying discontinuities in their early stages.

By investing in reliable inspections and appropriate END products, industry strengthens its operations, increases the reliability of its assets, and plays an essential role in preserving life .

Cost reduction and impact on the company’s financial health

Although often viewed merely as an operational cost, Non-Destructive Testing, in practice, represents an investment with a measurable return.

Early fault detection prevents:

• unscheduled stops;
• rework and scrapping;
• catastrophic failures;
• Accidents with human, environmental, and financial impact.

When compared to the cost of an operational failure, the investment in END (Non-Destructive Testing) and quality products becomes small. Companies that adopt routine inspections and structured END programs show greater cost predictability and better financial health over time.

END as a quality inspection and routine tool

Non-destructive testing is widely used as a quality control tool, both in production processes and in maintenance programs.

They act at different times:

• Raw material inspection;
• welding process control;
• verification of manufactured components;
• periodic maintenance inspections.

Routine END inspection demonstrates industrial maturity, enabling traceability, standardization, and compliance with technical standards and contractual requirements. In this way, END directly contributes to the final quality of the product delivered to the customer.

How a quality product in END impacts the entire company

Choosing the right products for Non-Destructive Testing goes far beyond the technical aspects. A low-quality END product can generate hidden costs and compromise the entire inspection system.

The impact is reflected in various sectors of the company:

Purchases and acquisitions

Reliable products reduce rework, internal complaints, and performance variations, facilitating standardization and supplier management.

Maintenance

Consistent results allow for more accurate diagnoses, avoiding unnecessary interventions or recurring errors.

Quality

Reliable testing reduces nonconformities, unwarranted rejections, and increases the credibility of inspection results.

Facilities and operation

The reliability of END (Non-Destructive Testing) ensures operational continuity, safety, and a longer lifespan for assets.

Board of Directors and Management

Risk reduction, cost predictability, and preserving the company’s image directly impact strategic decisions.

Financial health: Fewer failures, fewer accidents, and fewer stoppages result in greater operational efficiency and business sustainability.

Non-Destructive Testing Solutions as a Reliability Factor

For END (Non-Destructive Testing) to fulfill its strategic role, the correct combination of the following is fundamental:

• appropriate test method;
• qualified and approved technical procedure;
• qualified professionals;
• Products developed in accordance with applicable technical standards.

Reliable END solutions contribute to consistent results, operational safety, and regulatory compliance, strengthening the entire industrial chain.

Final considerations

Non-destructive testing is an invisible pillar of modern industry. It protects people, ensures the integrity of assets, reduces costs, and sustains the quality of products and processes.

Companies that view END (Non-Destructive Testing) merely as an obligation miss the opportunity to use it as a strategic tool for management, safety, and sustainability . Conversely, those that invest in reliable inspections, quality products, and technical expertise strengthen their operations and build a legacy of industrial excellence.

Excellence in products for those seeking reliable results

Metal-Chek provides complete solutions for Non-Destructive Testing , with products developed according to the main ASTM, ISO, ASME, NM and PETROBRAS standards, contributing to the quality, safety and reliability of industrial inspections.

👉 Access our blog and check out various technical content about END
👉 Follow Metal-Chek on Instagram: @metalchek and on LinkedIn

In Fluorescent Penetrant (LP) and Fluorescent Magnetic Particle (FM) tests, UV-A light is not just an accessory—it is a critical detection tool. The quality of illumination used by the inspector defines what is seen… and what can go unnoticed.

To ensure that the UV-A source truly offers stability, safety, and adequate performance, the industry has adopted ASTM E3022-25, now considered the most rigorous technical standard in the world for UV-A LED luminaires used in END (Non-Destructive Testing).

Why was ASTM E3022-25 created?

ASTM E3022-25 was created precisely to establish minimum and verifiable requirements that define when a UV-A LED light fixture is truly suitable for industrial inspections, especially in critical applications such as:

• Aerospace
• Automotive
• Oil & Gas
• Industrial maintenance
• Welding and structural integrity

In this way, the standard ensures that the luminaire operates within the necessary parameters, guaranteeing that the fluorescence of the penetrants and particles is visible and reliable.

What does ASTM E3022-25 require in practice?

The standard dictates that the luminaire must be tested as a complete unit, not by individual components. This eliminates the possibility of partial tests that do not represent actual performance.

Main requirements that a UV-A luminaire must meet:

* If applicable

This eliminates variations between units and ensures repeatability in the field.

Why is this standard important for safety and for the outcome of the inspection?

A non-compliant light fixture can:

• Reduce the useful inspection area;
• Change the intensity without the operator noticing;
• To utilize a wavelength and have a broad spectrum and reduce fluorescence;
• Increase the risk of undetected failures;
• Generating non-conformities in technical audits (NADCAP, etc.).

For industries that work with critical components — such as structural welds, shafts, bearings, rotors, aeronautical components, and automotive parts — this difference is crucial.

Relationship of ASTM E3022-25 with other END standards

The standard is cited and used as a reference in several technical documents, such as:

• ASTM E1417, ASTM E165 (Liquid Penetrant)
• ASTM E1444, ASTM E709, ASTM E3024 (Magnetic Particles)
• ISO 3059 (Lighting requirements for END)

This reinforces the importance of E3022-25 as a quality base for any UV-A lamp used professionally in END (Non-Destructive Testing).

Final message for inspectors, engineers, and quality managers.

ASTM E3022-25 is not merely a regulatory formality.

It represents a commitment to:

Reliability of the indications

• Operational safety
• Standardization of inspection
• Reproducibility of results
• Compliance with audits

Thus, by using UV-A lamps certified according to this standard, the professional reduces risks, in addition to increasing precision and strengthening the entire quality chain of Non-Destructive Testing.

Stay tuned for updates!

We will soon be presenting important news related to our line of lighting fixtures for END (Non-Destructive Testing).
Follow our blog and social media channels to stay updated on upcoming releases.
Contact our technical consultants .

Excellence in products for those seeking reliable results.

Metal-Chek offers complete solutions for Non-Destructive Testing, developed according to the main technical standards of the sector.
Count on our line of consumables, accessories, and equipment designed to guarantee safety, precision, and compliance in every inspection.

In industrial settings, consumables for Non-Destructive Testing (END) are true allies of reliability. Penetrant liquids, magnetic particles, and developers are formulated to deliver sensitivity , contrast, and stability —three pillars that support the precision of inspections.

One critical point that cannot be overlooked: storage. When done improperly, it accelerates product degradation and directly compromises the test results.

And in industrial inspection, a mistake never comes alone — it translates into rework, costs, and risks.

Therefore, taking care of expiration dates and storage conditions is not just a good practice:  it is fundamental to maintaining the performance and technical compliance required in industrial inspections.

Why proper storage is essential

END consumables undergo rigorous formulations, developed to maintain their properties throughout use. However, factors such as humidity, temperature, and expiration date can compromise them.

• sensitivity in detecting discontinuities,
• contrast of the indications,
• chemical stability
• Repeatability of results .

When exposed to unsuitable conditions, they may:

• to crowd together,
• evaporate,
• change color, odor or viscosity,
• lose sensitivity,
• to generate false indications or mask real flaws.

A degraded product can alter the test results.

Effects of moisture on END consumables

Moisture is one of the main factors that affect the quality of consumables.
When present in excess, it can cause clumping of powdered consumables, changes in product characteristics,  affecting performance and sensitivity.

To avoid these effects, it is important to store the products in dry, well-ventilated places, protected from condensation and sudden temperature changes. In addition, it is recommended to keep the packaging tightly closed, especially in environments with high relative humidity.

Temperature and chemical stability

Temperature has a direct impact on the chemical stability of END consumables. Excessive heat
can alter pigments, cause the evaporation of volatile components, and compromise the performance of penetrants, developers, and magnetic suspensions.
Extreme cold, on the other hand, can cause the crystallization of components , rendering the product unusable.

To ensure optimal stability and sensitivity, it is recommended to store consumables as follows:

• In cool environments , with controlled temperatures between 5°C and 40°C;
• Keep away from heat sources, direct sunlight, and open flames;
• Avoid prolonged exposure to temperature variations.

Validity and usage control

Each consumable has an expiration date defined by the manufacturer, which must be strictly respected.
After this period, there is no guarantee of stability or performance — the product may show changes in color, odor, viscosity, or the formation of residues, indicating degradation of the active components.

In addition to the expiration date, it’s important to check:

• Storage conditions ;
• Label integrity and batch identification .

Good practice includes using the FIFO (first in, first out) principle, ensuring that older products are consumed before new ones.

Good storage practices

1. Store upright to prevent leaks or deformation of the packaging.
2. Avoid stacking cans or aerosols to prevent pressure damage.
3. Keep the products sealed until the moment of use.
4. Do not mix products from different manufacturers — chemical compatibility is not guaranteed.
5. Visually inspect the product before use: changes in appearance indicate loss of stability.
6. Use appropriate storage methods , keeping them away from electrical sources and intense heat.

These measures help preserve the original characteristics of END consumables and ensure testing with maximum repeatability and reliability.

Why follow these guidelines?

Following good storage and expiration date control practices reduces costs, avoids rework, and ensures the integrity of inspection results .
Proper preservation of END consumables is an essential part of quality management in industrial inspections , ensuring that each application maintains the expected performance standard from the first to the last use.

Properly storing and controlling END consumables is an investment in reliability, safety, and durability .
By maintaining ideal temperature, humidity, and shelf-life conditions, inspection ensures consistent results that comply with industry technical requirements.

The inspection begins long before the test is performed — it begins in the warehouse.

Metal-Chek provides complete solutions for Non-Destructive Testing: penetrant liquids, magnetic particles, developers and accessories, developed with cutting-edge technology to offer safety, precision and reliable results in every inspection.

○ Need technical support? Our Metal-Chek consultants are ready to help.

○ Keep learning: explore more technical articles about END on our blog .

○ Join the community of END inspectors and professionals — follow @metalchek .

In industrial inspection, fluorescence in non-destructive testing (END) is a technology that significantly enhances sensitivity and visual accuracy.

Applied in methods such as Liquid Penetrant (LP), Magnetic Particle (MP), and Leak Detection (DV), this technique allows for the identification of minute discontinuities and micro-leaks invisible to the naked eye. The result is greater safety, reliability, and operational performance.

What is fluorescence?

Fluorescence is an optical phenomenon in which certain substances absorb energy from ultraviolet (UV-A) light and re-emit it in the form of visible light .
In non-destructive testing (END), this physical principle is used to enhance the contrast of indications on metallic and non-metallic parts, facilitating the identification of surface or subsurface defects .

When UV-A light (365 nm) strikes the inspected material, the fluorescent particles or dyes react by emitting intense light—typically in shades of green, yellow, or orange. This makes discontinuities clearly visible, even in hard-to-reach areas.
The result is a highly sensitive, precise, and visually clear test that allows for quick and reliable decisions.

Applications of fluorescence in END methods

1. Liquid Penetrant Testing (LP)

The LP fluorescent (Type I) method is indicated for detecting surface-open discontinuities, such as cracks, pores, lack of fusion, and other defects that may compromise the integrity of a component.

After cleaning and applying the penetrant, the excess is removed and the developer is applied. Under UV-A light, the remaining liquid in the discontinuities emits intense fluorescence, clearly revealing the indications.

Among the main advantages is its versatility of application.
The method can be used on metallic and non-metallic materials, whether magnetic or non-magnetic, such as aluminum, magnesium, austenitic stainless steels, and titanium.
It can also be applied to ceramics, glass, and some types of plastics, provided they are non-porous materials.

Metal-Chek Products:

• FP-91 and FP-91 HI – Water-washable penetrants, Type I – Method A, Level 2, ideal for inspections requiring greater sensitivity.

Compatible with D70, D72 and D702 developers.

2. Magnetic Particle Testing (MPT)

In ferromagnetic materials, fluorescence enhances the detection of surface and subsurface discontinuities. Fluorescent magnetic particles
accumulate in regions where the magnetic field escapes, forming visible indications under UV-A light. For magnetic particle testing to be effective, it is essential that the part be magnetized. The application of a magnetic field —circular, longitudinal, or combined—creates magnetic flux lines in the material.

Metal-Chek offers the Supermagna Yoke HMM6, an alternating current (AC) electromagnetic yoke developed for visible and fluorescent testing. The equipment provides a stable magnetic field and high mobility, making it widely used in industrial, petrochemical, and predictive maintenance inspections.

Metal-Chek Products:

• Supermagna LY 800 – High-sensitivity fluorescent dry-process magnetic particle.
• Supermagna LY 2000, LY 2000 V, LY 3000 and LY 3000 V – Wet-applied fluorescent magnetic powder particles, applicable with OMC 10 MMS (oil) or BC 502 SN + water vehicles.
• Supermagna CLY 2000 VO MMS BP / CLY 3000 O MMS BP / VO MMS BP – Ready-to-use wet (oil) baths with high mobility and contrast.
• Supermagna DLY 2000 – Water-dispersible wet magnetic particle.
• Supermagna CRL 265 AG/SN – Dual concentrate (fluorescent/visible), applicable under visible (white) or UV-A light in environments up to 1000 lx.

3. Leak Detection (Leak Testing)

In leak tests, fluorescent additives allow visualization of micro-leaks in hydraulic, pneumatic, and lubrication systems.
Under UV-A light, even the smallest leaks become visible, enabling immediate repairs and preventing critical failures.

Metal-Chek Products:

• Oil-Glo Ultra SPI Series
  • SPI-OGG (Green) , SPI-OGB (Blue) and SPI-OGW (White) — Fluorescent detectors for oily fluids.
  • Non-flammable, they do not alter the properties of fluids and are NSF certified .
• Water-Glo Ultra SPI Series – Green (WGG) and blue (WGB) fluorescent dyes for aqueous systems.

UV-A Lighting Equipment

For fluorescent testing, it is essential to use UV-A (365 nm) light sources with a minimum intensity of 1000 µW/cm² on the surface being examined, in accordance with END technical standards.
This intensity ensures adequate contrast and accurate reading of the indications.

Benefits of fluorescence in END

The correct application of fluorescence brings significant technical advantages:

• High visual sensitivity , revealing minute discontinuities.
• Greater contrast and clarity of the indications.
• Safe and versatile application in different methods and materials.
• Technical compliance with national and international standards.
• Reduction of rework and operational errors.

Furthermore, fluorescence improves the reliability of results and strengthens quality control in critical inspections.

Fluorescence in non-destructive testing is an essential technology that raises the standard of precision, safety, and reliability in industrial inspections.
By applying this technique in liquid penetrant testing (LP), mechanical testing (PM), and visual diffusion (DV), enhanced visualization, high sensitivity, and immediate results are obtained, reducing failures and ensuring operational reliability.

With the complete Metal-Chek product line — which includes penetrants and fluorescent particles, leak detection additives, magnetization equipment, and UV-A illumination — your industrial inspection reaches new levels of quality and technical compliance.

See beyond the visible — Metal-Chek fluorescent technology.
Solutions for Non-Destructive Testing.

Talk to our experts
and follow us on @metalchek

In Magnetic Particle (MP) testing, the correct contrast between the surface and the magnetic particles is what guarantees the visibility of the indications and the accuracy of the results.
More than just a product, the Supermagna Contrast 104 Metal-Chek in Magnetic Particle Testing represents the practical application of the contrast concept in visible inspections, meeting the requirements of ASTM E709, NM 342 and PETROBRAS N-1598 standards.

Function of Supermagna Contrast 104 in Magnetic Particle Testing

The Supermagna Contrast 104 in Magnetic Particle Testing functions to create a uniform white background on the surface of the part or inspection area, upon which colored magnetic particles (visible method, usually black or red) accumulate, making indications of discontinuities more visible under ambient light. The uniform white background increases the visual difference between the part and the particles accumulated over possible surface discontinuities.

Without adequate contrast, subtle indications may go unnoticed, reducing the sensitivity of the assay and compromising the reliability of the results.

In summary, the Supermagna Contrast 104:

• It forms a highly reflective white background , ideal for visible testing;
• It increases the optical contrast between the surface and magnetic particles;
• It facilitates the visual interpretation of the instructions by the inspector;
• It directly contributes to the reproducibility and standardization of PM tests.

When to use Supermagna Contrast 104

Supermagna Contrast 104 is indicated for colored magnetic particle testing (visible method), conducted under visible illumination with a minimum intensity of 1076 lux, as established by ASTM E709, NM 342 and PETROBRAS N-1598 standards.

Precautions when applying and removing

In order to guarantee optimal performance and avoid interference with the result, it is recommended:

1. Surface preparation

The area to be inspected must be dry, clean, and free of oil, grease, paint, or mill scale. Prior cleaning with E59 Metal-Chek
is recommended, ensuring a perfectly prepared surface to receive Supermagna Contrast 104.

2. Uniform application

Supermagna Contrast 104 should be applied in a thin, even layer, avoiding excess.
Very thick layers compromise the sensitivity of the assay.

3. Drying

Allow to dry completely before applying the magnetic particles.
The surface should have a uniform, matte, and non-reflective appearance.

4. Removal

After testing, Supermagna Contrast 104 can be removed with a remover such as E59 or TMC 10 Metal-Chek, ensuring thorough cleaning without damaging the surface.

Why choose the Supermagna Contrast 104 Metal-Chek?

The Supermagna Contrast 104 Metal-Chek was developed for professionals seeking precision and performance in magnetic particle testing.

Main benefits:

• High coverage and quick drying , optimizing inspection time;
• An adherent and uniform layer , respecting the thickness limits;
• Intense optical contrast that highlights even the smallest details;
• Compatible with Supermagna BW 333, RW 222, SBW 333/O, SRW 222/O and YD 404 colored magnetic particles.

Technical notice

This content is for educational purposes only. The application of the test methods and parameters must follow a qualified procedure approved by a Level 3 Inspector.

Metal-Chek Excellence

The Supermagna Contrast 104 is more than just a support product:
it is an essential technical element to guarantee quality, sensitivity, and safety in visible magnetic particle testing.

Using the Supermagna Contrast 104 Metal-Chek means investing in standard, precision and reliability, fundamental pillars for those seeking excellence in Non-Destructive Testing.

“Precision is visibility — ensure reliable results with the Supermagna Contrast 104 Metal-Chek.”

Talk to our experts
and follow us on  @metalchek

Understand how the pear-shaped decanting tube contributes to the precision and reproducibility in controlling the concentration of magnetic particles (MP), in accordance with applicable technical standards.

The role of the per a type decanting tube

Magnetic particle testing (MPT) is widely used to detect surface and subsurface discontinuities in ferromagnetic materials. In wet
testing, the appropriate concentration of magnetic particles in the bath is crucial for the sensitivity and repeatability of the results.

One technical detail makes all the difference: the use of the “pear” type decanting tube, an essential accessory for measuring the bath concentration with precision, speed, and traceability.

Supermagna Pear-Type Decanter Tube: what it is and how it works

The Supermagna Pear-shaped Decanter Tube is an auxiliary accessory used to determine the quantity of magnetic particles per volume of fluid in the suspension used in wet dispersion testing. With a graduated scale, it allows for the reading of the volume of particles settled after a period of rest.

There are two main models, developed according to the type of particle:

• Supermagna Decanting Tube with a 0.1 ml scale (fine scale): suitable for colored particles ;
• Supermagna Decanting Tube with a full scale of 0.05 ml (most sensitive scale):suitable forfluorescent particles.

Main applications:

• Verification of the correct concentration of the magnetic particle bath before performing the test;
• Assessment of contamination levels in the bath during use.

Why concentration control is essential

With continuous use, the magnetic particle bath can undergo changes that directly compromise the reliability of the results. Among the main causes are:

• Evaporation of the liquid phase;
• Natural settling of particles;
• Contamination by oil, dirt, or metallic residue.

These variations can affect the sensitivity of the assay:

• Excess particles : generate false readings and increase background noise;
• Low concentration : reduces visibility and makes it difficult to detect actual discontinuities.

In addition to proper control, the quality of the magnetic particles used is a determining factor in the test’s performance.

Metal-Chek magnetic particles are developed with specific formulations to meet regulatory requirements.

How to properly use the Supermagna Pear-shaped Decanter Tube

The use of the Supermagna pear-shaped decanter tube
must follow the specific instructions for each product and vehicle, in addition to the guidelines of the qualified test procedure. Generally, the process involves agitating the suspension for homogenization, filling the tube to the indicated volume, and allowing it to stand for a sufficient time for the particles to settle by gravity.

After the defined period, the decanted volume is read, observing the interface between the fluid and the particles.
The reading must be performed according to the type of particle used:
– For colored particles, visible light should be used to provide good visibility of the separation line between the fluid and the particles.
– For fluorescent particles, the reading requires the use of ultraviolet (UV-A) light, in a darkened environment, according to the requirements established by applicable standards.

The results obtained serve as a comparison with the reference values ​​indicated by the manufacturer of the magnetic particles or according to the technical procedure approved by a Level 3 Inspector, ensuring that the concentration control is in accordance with the established practices for the test.

Normative references

Concentration control with the Supermagna pear-shaped decanter tube is supported by the main international and national standards applicable to magnetic particle testing, such as:

• ASTM E709 – Standard Guide for Magnetic Particle Testing
• NM 342 – Non-Destructive Testing — Magnetic Particles — Discontinuity Detection
• PETROBRAS N-1598 – Magnetic Particle Testing
• ASME Section V, Article 7 – Magnetic Particle Examination

Good practices and frequency of control

To maintain suspension stability, it is recommended to:

• Perform concentration checks daily (or before each inspection shift);
• Record the results in spreadsheets or quality control forms;
• Renew the bath whenever there is visible contamination, foam, or variation outside the defined limits ;
• Periodically check the physical condition of the settling tube (cracks, dirt, or illegible scale).

These practices contribute to reproducibility in testing and reliability in results, in order to avoid rework and waste.

Technical notice

This content is for educational purposes only. The application of the test methods and parameters must follow a qualified procedure approved by a Level 3 Inspector.

Metal-Chek Excellence

Excellence in products for those seeking reliable results.
Metal-Chek provides complete solutions for Non-Destructive Testing (END) : magnetic particles, contrast dyes, yokes, accessories, and settling tubes — all developed according to the main ASTM , ASME , NM , and PETROBRAS standards.

Talk to our experts
and follow us on @metalchek

Discover the differences between the dry and wet methods of magnetic particle testing, their practical applications, and how to ensure reliable results according to technical standards.

The importance of the correct method in Non-Destructive Testing

Magnetic particle testing (MPT) is widely used in industry to detect surface and subsurface discontinuities in ferromagnetic materials.
The method is valued for its sensitivity, speed, and low operating cost, and is applied in sectors such as oil and gas, automotive, metallurgical, and aeronautical.

However, to ensure accurate results, it is essential to understand the differences between dry and wet methods, as each has specific characteristics and applications.

Principle of the test

The magnetic particle method is based on the magnetization of a ferromagnetic material. When the magnetic field encounters a discontinuity, a leakage field
is formed, attracting the magnetic particles and creating an indication  on the surface.

These particles can be colored (visible under white light) or fluorescent (visible under UV-A light), according to ASTM E709 – Standard Guide for Magnetic Particle Testing and NM 342 – Non-destructive testing — Magnetic particles — Discontinuity detection.

Magnetic particle testing – dry method: practicality and speed in the field

The dry method uses magnetic powder particles applied directly to the part during magnetization.
These particles adhere to the leakage field areas, forming indications visible to the inspector.

Main characteristics of the dry method

• Ideal for field testing or inspections of large structures;
• It eliminates the need for liquid vehicles, making the process portable and fast ;
• Suitable for rough, uneven or complex geometric surfaces ;
• It can be applied to parts at high temperatures (up to 180 °C).

Did you know?

• Metal-Chek’s SUPERMAGNA WD-55 particle can be used up to 400 °C .
• Metal-Chek’s SUPERMAGNA CRL 265 AG/SN particle can be applied in non-darkened environments with visible light intensity up to 1000 lx .

Limitations of the dry method

• Lower sensitivity than the wet method, especially in small discontinuities;
• It can lead to uneven particle buildup if not applied properly;
• The inspector needs experience to interpret the instructions.

Magnetic particle testing – wet method: precision and sensitivity

In wet spectroscopy, magnetic particles are suspended in water or oil, forming a homogeneous suspension applied to the surface during magnetization.
This technique offers greater particle mobility, resulting in improved sensitivity in detecting discontinuities.

Main characteristics of the wet method

• Suitable for high-precision testing ;
• It allows the use of fluorescent particles , inspected under UV-A light ;
• It requires strict control of the suspension regarding concentration and contamination;
• The measurements are verified using a pear-shaped decanter tube (ASTM E709).

For fluorescent particles, the ideal concentration is between 0.1 and 0.4 mL ; for colored
particles, between 1.2 and 2.4 mL, according to ASTM E709 and NM 342.

Limitations of the wet method

• Requires additional equipment (UV flashlight) for the fluorescent technique;
• A darkened environment is required for fluorescent techniques;
• Greater process control is needed (concentration and contamination).

Important notice:This article is for educational purposes only. The definition of the test method, technique, and parameters must be carried out by a Level 3 Inspector in a qualified and approved procedure.

Metal-Chek products in compliance with regulations

Metal-Chek offers complete solutions for magnetic particle testing, developed in accordance with the main international standards:

• Colored and fluorescent magnetic particles (dry and wet methods);
• Water-based suspension conditioners ;
• High-opacity contrast inks for inspections under white light;
• Supermagna HMM6 electromagnetic yokes , robust, portable and standard compliant.

All products are formulated to meet regulatory requirements, ensuring compliance, sensitivity, and repeatability of results.

When to apply each magnetic particle testing method

The dry and wet methods of magnetic particle testing are distinct, and their application should be based on the test conditions and procedural requirements.

Regardless of the method, using reliable products with proven quality is essential to ensure consistent and reproducible results — and that’s where Metal-Chek stands out.

Excellence in products for those seeking reliable results.

Metal-Chek provides complete END solutions: magnetic particles, contrast inks, conditioners, and electromagnetic yokes, developed according to the main ASTM, ASME, NM, and PETROBRAS standards, guaranteeing safety, precision, and technical compliance in every inspection.

Discover the complete Metal-Chek product line.

Contact  our team .

Follow @metalchek