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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.

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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.”

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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

The importance of technical standards in Non-Destructive Testing

Non-destructive testing (END) is essential to ensure the integrity of equipment and components used in various industrial sectors.
Among the most widely used methods are liquid penetrant testing (LP) and magnetic particle testing (PM).

Both allow the identification of discontinuities that could compromise the safety and performance of metal structures, welds, shafts, or castings, etc.

To ensure the quality and standardization of results, there is a set of national and international technical standards that establish criteria for execution, materials, and test conditions.

Next, see what these rules are and what each one determines in summary.

Standards applicable to Penetrant Testing (PT)

ASTM E1417 – Standard Practice for Liquid Penetrant Testing

It is the main international standard for the Penetrant Testing method.
It defines the essential parameters for the safe and accurate execution of the test, including:

• Classification of penetrants (fluorescent and colored);
• removal methods (water washable, post-emulsifiable, solvent removable);
• lighting and sensitivity requirements;
• stages of the process, such as cleaning, penetration, and development.
• process controls.

ISO 3452 – Non-Destructive Testing – Penetrant Testing

The ISO 3452 series establishes international standards for materials and equipment.
Among its main topics are:

• Part 1: General principles;
• Part 2: Penetrant material requirements;
• Part 3: Reference blocks;
• Part 4: Equipment;
• Part 5: Requirements for liquid penetrant testing at temperatures above 50 °C.

NM 334 – Non-destructive testing — Penetrant testing — Discontinuity detection

Mercosur standard that defines the main requirements for LP inspections in the national context, including:

• technical terminology and symbology;
• test stages (pre-cleaning, application, penetration, removal, development and evaluation);
• minimum lighting levels;

ASTM E165 – Standard Practice for Liquid Penetrant Testing for General Industr y

Standard that defines the general procedures and criteria for liquid penetrant testing (LP) in industrial applications.
Establishes requirements for:

• Classification of penetrants (fluorescent or colored);
• removal methods (water, solvent or post-emulsifiable);
• Control of lighting, temperature, and penetration time;
• Sensitivity testing and product quality control.

PETROBRAS N-1596

Define:

• test parameters and minimum/maximum process times;
• procedural requirements;
• lighting conditions;
• Product classification and traceability;
• Requirements for staff execution and qualification.

PETROBRAS N-2370

Provides:

• General guidelines for safety, documentation, and traceability;
• Penetrant testing.

ASME V – Art. 6

An integral part of the ASME Boiler and Pressure Vessel Code (BPVC), it defines the requirements for penetrant testing applied to boilers, pressure vessels, and pressurized equipment.
It contains:

• Specifications for materials and equipment;
• sensitivity check of the test system;
• process control and inspection intervals;
• Acceptance according to manufacturing codes.

Standards applicable to Magnetic Particle Testing (MPT)

ASTM E709 – Standard Guide for Magnetic Particle Testing

The principal international standard governing magnetic particle testing.
It establishes best practices and application guidelines for:

• Magnetization techniques (yoke, electrodes, coil, center conductor and direct contact);
• use of colored and fluorescent particles;
• Electrical current control and field direction;
• Verification of particle concentration and illumination (visible and UV).

ASTM E3024 – Standard Practice for Magnetic Particle Testing for General Industry

It complements ASTM E709 and provides specific instructions for inspections in general industry.

NM 342 – Non-destructive testing — Magnetic particles — Discontinuity detection

It establishes technical parameters for conducting the test in accordance with international standards:

• Dry and wet application;
• characteristics of magnetic particles and liquid vehicles;
• Recommended concentration ranges for wet application (0.1 to 0.4 mL for fluorescent and 1.2 to 2.4 mL for colored);
• Light intensity control for visible and UV-A light.

ASTM E1444 – Standard Practice for Liquid Penetrant Testing for Aerospace

Specifically for the aeronautical and aerospace sector, it defines detailed practices for magnetic particle (PM) testing.
It establishes:

• requirements for magnetic materials and vehicles;
• concentration limits and bath control;
• UV-A and white light checks;
• Strict calibration and acceptance criteria.

PETROBRAS N-1598

It defines the criteria for performing the PM method on ferromagnetic materials.
It covers:

• magnetization techniques;
• UV lighting requirements and field strength;
• calibration procedures.

ASME V – Art. 7

Part of the ASME Boiler and Pressure Vessel Code, it defines the requirements for magnetic particle testing of pressurized equipment and welded components.
It covers:

• Types of electric current and magnetization techniques;
• magnetic field intensity control;
• detection methods;
• Acceptance and qualification criteria for the testing system.

ISO 9934 – Non-Destructive Testing – Magnetic Particle Testing

The ISO 9934 series establishes international standards for materials and equipment.
Among its main topics are:

• Part 1: General principles;
• Part 2: Detection method;
• Part 3: Equipment;

Importance of technical standards for the reliability of END (Non-Destructive Testing).

The standards governing liquid penetrant and magnetic particle methods are the technical basis that ensures reliability and regulation  of Non-Destructive Testing.
They guide everything from product development to practical application in the industrial environment, ensuring quality, safety, and standardization in every inspection.

Knowing these standards is essential for anyone working in quality control, maintenance, and inspection — whether in heavy industry, petrochemicals, aeronautics, or metallurgy.

Important 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 .

Solution in Non-Destructive Testing

Metal-Chek provides complete END solutions: penetrant liquids , magnetic particles , yoke and accessories , developed according to the main ASTM, ISO , ASME, NM, PETROBRAS standards, guaranteeing quality, safety and technical compliance in every inspection.

Discover the complete Metal-Chek product line.

Contact our team.

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Discover how the Metal-Chek Supermagna Yoke HMM6, SBW 333/O and 104 Contrast combination ensures faster, more accurate and safer magnetic particle inspections, in compliance with technical standards.

Why reliable inspection is vital in industry

In industry, reliability means economy and safety . After all, an unidentified surface discontinuity can compromise the operation of critical equipment, generate rework, unscheduled downtime, and even accidents.
Therefore , the application of Non-Destructive Testing (END) techniques is indispensable. Among the available methods, magnetic particle inspection (MPI) stands out for its high sensitivity to ferromagnetic materials.

However, simply having good equipment is not enough: it is also essential to have the right magnetic particles and an efficient contrast agent to guarantee consistent results.
This is precisely where Metal-Chek’s proposal comes in: the combination of the Supermagna Yoke HMM6, the SBW 333/O and the Contrast Agent 104. Together, these products form a complete system that ensures fast, accurate and safe inspections.

Supermagna Yoke HMM6: Power and Robustness in the Field

The Supermagna Yoke HMM6 is a portable electromagnetic device designed to generate the magnetic field (AC – Alternating Current) necessary for magnetic particle inspection using the yoke technique.
Furthermore, its robust construction makes it ideal for both field and factory use.

Main features:

• Portable and robust – ideal for field and factory inspections.
• With no current conduction through the part – magnetization is achieved by an magnetic field, ensuring greater safety.
• Applications – welding, metal structures, castings and forgings.
• Regulatory – complies with the main national and international standards. 

SBW 333/O: Visible Magnetic Particles in Oily Suspension

Magnetic particles are responsible for making visible the discontinuities present in the magnetized part.

SBW 333/O is an oil-based suspension for visible wet manifolds, formulated to offer high sensitivity and stability.

This ensures clear and consistent indications during the inspection process.

Highlights:

• Ready to use.
• Excellent visualization of discontinuities in finished products.
• High definition of indications under visible light, with excellent sensitivity.

Contrast 104: Enhanced Visibility

Contrast 104 creates a white background that enhances the indications of visible magnetic particles, ensuring maximum definition and reliability in inspection.

In other words, it improves the readability of the information and contributes to a more accurate interpretation.

Main functions:

• It increases the contrast between the particles and the surface.
• Increased sensitivity of the assay.
• Compliance with technical standards.

How the Supermagna Yoke HMM6 + SBW 333/O + Contrast 104 Combination Works

In a simple and efficient way, the process occurs in four stages:

1. Application of Contrast 104 – uniform white background on the area to be inspected.
2. Magnetization with the Supermagna Yoke HMM6 – generation of a magnetic field on the workpiece.
3. Application of SBW 333/O – visible oily suspension deposited on the magnetized surface.
4. Interpretation of results – particles accumulate in field escape regions, immediately revealing surface discontinuities.

Advantages of the Metal-Chek Combination

• High sensitivity – greater accuracy in detecting surface discontinuities.
• Operational speed – visible indicators at the time of inspection.
• Versatile application – sectors such as oil & gas, energy, metallurgy, automotive, naval and nuclear.

Furthermore, this combination reduces rework and increases the efficiency of inspection teams.

Technical Reference Standards

The combination of Supermagna Yoke HMM6 + SBW 333/O + Contrast 104 meets the requirements of international and national standards, such as:

• ASTM E709
• ASTM E3024
• ISO 9934 (1 and 2)
• NM 342
• ASME BPVC Section V, Article 7
• PETROBRAS N-1598

Why choose Metal-Chek?

Metal-Chek is a national leader in Non-Destructive Testing solutions , with products developed according to rigorous quality standards and tested in real industrial applications.

Therefore, by adopting the Supermagna Yoke HMM6 + SBW 333/O + Contrast 104 combination, your company gains in:

• Reliability of results.
• Speed ​​in execution and interpretation.
• Safety and operational efficiency.

Magnetic particle inspection is a well-established method among Non-Destructive Testing and remains essential for ensuring the integrity of metallic components and structures. Its effectiveness, however, depends directly on the quality of the equipment and products.

With the combination of the Supermagna Yoke HMM6, the SBW 333/O and the 104 Contrast, Metal-Chek delivers a complete solution for performing Non-Destructive Testing.

In this way, the inspection gains in reliability, speed, and operational safety.
This integration ensures:
• Reliability and accuracy in the results.
• Speed ​​in the execution and interpretation of the indications.
• Safety and efficiency in industrial operations.

If your company’s goal is to raise inspection standards and strengthen process reliability, count on Metal-Chek.

Metal-Chek – a leader in solutions for Non-Destructive Testing.

Speak with our experts and get your questions answered.

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THE POWER OF COMBINATION

Discover how the combination of Supermagna Yoke HMM6, magnetic powder particles, BC 502 SN Conditioner and 104C Contrast ensures fast, compliant and safe magnetic particle inspections.

In industrial maintenance, the reliability of inspections is crucial to avoid rework, equipment failures, and costs associated with unscheduled downtime.

Among Non-Destructive Testing (END) methods, magnetic particle inspection (MPI) is one of the most widespread techniques for detecting surface and subsurface discontinuities in ferromagnetic materials .

For reliable results, good magnetization equipment alone is not enough. High-quality magnetic particles, a suitable conditioner, and an effective contrast agent are also necessary.

This is where Metal-Chek stands out, offering a robust combination for the industry: the Supermagna Yoke HMM6, magnetic powder particles associated with the BC 502SN Conditioner and the 104C Contrast.

Supermagna Yoke HMM6: Robustness and Compliance

The Supermagna Yoke HMM6 is an electromagnetic yoke designed to generate the necessary magnetic field during inspection.

Main features:

• Portable and robust – ideal for field and factory inspections.
• Safe – it does not conduct current through the part, but induces a longitudinal magnetic field.
• Versatile – suitable for inspecting welds, castings, forgings, metal structures, etc.

Regulatory – complies with the main national and international standards.

Magnetic Particles + BC 502 SN Conditioner

The use of magnetic powder particles, combined with BC 502 SN Conditioner, is the most widely adopted method for forming stable and efficient suspensions.

Function of magnetic particles:

• They make surface and subsurface discontinuities visible by accumulating in regions where the applied magnetic field escapes.
• The concentration can be adjusted according to the procedure.
• Available in different options for visible or fluorescent inspections.

Function of BC 502 SN Conditioner:

• It guarantees corrosion protection .
• Allows for uniform dispersion of particles .
• It promotes proper moisturization and mobility  on the surface.
• Compliant with technical standards requirements.

104C Contrast: Enhanced Visibility and Precision

Contrast 104C is applied before magnetization and magnetic particle bathing, creating a uniform white background.

Main functions:

• It increases the contrast between the particles and the surface.
• Increased sensitivity of the assay.
• Compliance with technical standards.

How the Combination Works

1. Applying Contrast 104C – creates a contrasting and uniform white background.
2. Magnetization with the Supermagna Yoke HMM6 – generates the necessary magnetic field.
3. Application of the prepared suspension (particles + BC 502 SN) – the particles agglomerate in the leakage field regions, forming indications.
4. Interpretation – with a white background and highlighted particles, the inspector can quickly and reliably identify discontinuities.

Advantages of the Combination

• High sensitivity in detecting discontinuities.
• Operational speed , with results visible immediately.
• Regulatory reliability , in accordance with ASTM, ISO, AMS, ASME and PETROBRAS standards.
• Flexibility , allowing adjustments to particle concentration.
• Safety is ensured through the use of a robust and secure yoke in various environments.

Technical Standards Supporting the Set

The combination meets the requirements of international and national standards, such as:

• ASTM E709
• ASTM E3024
• ISO 9934 (1 and 2)
• NM 342
• ASME BPVC Section V, Article 7
• PETROBRAS N-1598

Magnetic particle inspection is an essential technique for industrial maintenance and quality assurance. However, its efficiency depends on choosing the right equipment and supplies.

The combination of the Supermagna Yoke HMM6, magnetic particles with BC 502 SN Conditioner, and 104C Contrast ensures a fast, reliable, and safe inspection process.

With this complete solution, Metal-Chek reinforces its commitment to providing cutting-edge technology for Non-Destructive Testing, meeting the needs of the industry with excellence.

Speak with our  technical team  and discover how we can help transform your inspection routines into competitive advantages. 

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Discover how to plan and execute magnetic particle inspections, ensuring speed, reliability, and compliance with technical standards.

Industrial inspections can present challenges such as lack of infrastructure, space limitations, adverse conditions, and the need for fast and reliable results.

In this context, Non-Destructive Testing (END) using magnetic particles (MP) stands out as a practical solution for detecting surface discontinuities in ferromagnetic materials .

This practical guide is aimed at maintenance professionals, inspectors, and engineers, showing how to perform magnetic particle inspections efficiently, safely, and in compliance with regulations, even outside of controlled laboratory environments.

Surface Preparation

One of the biggest challenges in inspections is dealing with surfaces contaminated by grease, oil, welding spatter, or oxidation. Proper area preparation is essential to avoid false readings.

Recommended techniques:

• Steel brush (manual or rotary): quick removal of oxidation from welds and metal structures.
• Grinding: suitable for removing coatings and persistent oxidation.
• Solvents and clean cloths: remove grease and oils.

The better the preparation, the greater the reliability of the inspection.

Choice of Technique

The type of application of magnetic particles should consider environmental conditions, available time, and required sensitivity.

• Dry process:

Advantages → ideal for surfaces with high temperatures

Limitations → lower sensitivity to small discontinuities

• Wet method (water or oil):

Advantages → high sensitivity, suitable for detecting small discontinuities.

• Colored wet process

Advantages → visible under white light, no need for special lighting fixtures.

Limitations → operating temperature

• Fluorescent wet particles:

Advantages → maximum sensitivity under UV-A light.

Limitations → operating temperature, visible only under UV-A light.

Safety in Confined Spaces

Inspections of tanks, vessels, and confined structures require additional safety measures:

• Use portable and robust equipment , such as the Supermagna Yoke HMM6 , which works in different positions and does not conduct current through the workpiece.
• Respect occupational safety standards (e.g., NR-33 – Safety in Confined Spaces).

Choosing robust equipment is crucial for reducing risks and increasing reliability in challenging environments.

Technical Standards Governing Testing

Magnetic particle inspection can follow recognized standards to ensure reliable results:

• ASTM E709
• ISO 9934 (1 to 2)
• PETROBRAS N-1598
• ASME Section V, Article 7

Recommended Equipment for Inspections

For magnetic particle inspections, the ideal solution is to use equipment that combines durability, safety, and regulatory compliance.

The Supermagna Yoke HMM6, for example, is designed to meet these needs:

• Portable and robust.
• Safe in potentially explosive atmospheres.
• Meets ASTM, ISO, ASME and PETROBRAS standards.
• Suitable for inspections of welds, metal structures, castings, forgings, etc.

Magnetic particle inspection is a strategic tool for industrial maintenance. When performed correctly — with proper surface preparation, appropriate technique selection, and the use of reliable equipment — it ensures operational safety, regulatory compliance, and cost reduction.

If your company operates in sectors such as oil & gas, energy, automotive or metallurgical, the Metal-Chek Supermagna Yoke HMM6 is the ideal solution to guarantee reliable results within standards.

Speak with our technical team.

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In modern industry, the reliability of equipment and metal structures is a decisive factor for operational safety and cost reduction. A failure in a critical component can generate not only financial losses, but also put lives at risk. It is in this scenario that Non-Destructive Testing (END) plays a strategic role, as it allows the integrity of parts to be evaluated without causing damage.

Among the most widely used END methods, magnetic particle testing (MPT) stands out for its efficiency in detecting surface discontinuities in ferromagnetic materials . Within this method, one piece of equipment proves indispensable: the Supermagna Yoke HMM6 .

The Supermagna Yoke HMM6 is a portable device that has become an essential tool for industrial inspectors and maintenance technicians. Throughout this article, we will explore in detail what the Supermagna Yoke HMM6 is, how it works, its applications, regulatory requirements, and, most importantly, why it is fundamental to ensuring quality and safety in industrial inspections.

What is the Supermagna Yoke HMM6?

The Supermagna Yoke HMM6 is an inverted “U”-shaped electromagnet with two legs (fixed or articulated) that, when placed on a ferromagnetic surface, generates a longitudinal magnetic field between its poles. This field allows for the detection of surface flaws by applying magnetic particles to the inspected area.

Unlike other techniques, the Supermagna Yoke HMM6 does not conduct electrical current through the workpiece, but rather through the coil of the equipment itself. This characteristic offers two major advantages:

1. Safety: It can be used in potentially explosive or flammable atmospheres, as there is no risk of electrical sparks.
2. Preservation of the part: there is no risk of overheating or surface damage during the test.

Furthermore, the Supermagna Yoke HMM6 is designed to be both portable and rugged, making it ideal for field inspections, hard-to-reach locations, and situations where inspector mobility is critical.

Magnetic Fundamentals Applied to the Supermagnetic Yoke HMM6

To understand the importance of the Supermagna Yoke HMM6, it is necessary to revisit some basic concepts of magnetism:

• Magnetic field: the region around a magnet or conductor carrying an electric current where magnetic forces act.
• Leakage field: interruption in magnetic flux lines caused by a discontinuity, such as a crack or inclusion.
• Magnetic particles : dry powder or liquid suspension that, when applied to a magnetized surface, accumulates in the leakage field, visually revealing the fault.

The Supermagna Yoke HMM6, by magnetizing the part, highlights these discontinuities immediately.

Applications of the Supermagna Yoke HMM6 in Industry

The Supermagna Yoke HMM6 is widely used in sectors where structural safety and operational reliability are essential.

• Welding and boilermaking: inspection of weld beads, detection of cracks and lack of fusion.
• Petrochemical and oil & gas: pressure vessels, piping, flanges and critical connections.
• Automotive and rail sectors: axles, wheels, gears, rails, and braking systems.
• Aeronautical and aerospace: inspection of landing gear and structural components.
• Energy: hydraulic turbines, components for thermal and nuclear power plants.

In all these sectors, the Supermagna Yoke HMM6 stands out for its speed of application and immediate results, allowing for quick decisions regarding repairs or replacements.

Reference Standards

• ASTM E1444  – Standard practice for magnetic particle testing.
• ASTM E709  – Standard guide for magnetic particle testing.
• ASTM E3024 –  Guidelines covering equipment calibration, magnetization techniques, acceptance criteria, and personnel training.
• PETROBRAS N-1598 –  Establishes mandatory technical requirements and instructions on how to handle non-conformities for Non-Destructive Testing: Magnetic Particles.
• ASME Section V – Article 7 – Requirements for magnetic particle testing of ferromagnetic materials, applicable to pressure vessels, boilers, and other components covered by the ASME code.

Why is the Supermagna Yoke HMM6 Essential in Industrial Maintenance?

Because it goes far beyond just an inspection tool — it’s a strategic investment in safety, productivity, and compliance.

• Minimizes unscheduled downtime → detects faults before they escalate into breakdowns.
• Reduces costs → avoids rework and unnecessary replacements.
• Increased security → protects people and property.
• Mobility and practicality → ideal for teams that need agility in the field.
• Robustness and durability → ideal for intensive use in industrial environments.

The impact on your company

The Supermagna Yoke HMM6 for magnetic particle testing is a key component in industrial maintenance, combining simplicity, efficiency, and regulatory compliance. Its application in different sectors reinforces its relevance as an indispensable piece of equipment in inspection programs.

By choosing the Metal-Chek Supermagna Yoke HMM6, your company is guaranteed reliable results, expert technical support, and advantageous commercial terms.

Speak with our technical team and discover how the Supermagna Yoke HMM6 can increase the safety and efficiency of your inspections.

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In industrial maintenance, the efficiency of a solvent goes far beyond cleaning. E-59 is a clear example: developed as an aliphatic solvent, it plays a strategic role in both non-destructive testing (END) and heavy-duty cleaning of industrial components, especially in environments where lubricating oil is a constant challenge.

E-59 in Non-Destructive Testing

In inspection and quality control processes, choosing the correct solvent directly impacts the effectiveness of the tests. E-59 is widely used as part of the surface preparation steps in liquid penetrant testing, ensuring that parts and components are properly cleaned and free of contaminants before the method is applied. This results in greater accuracy in detecting discontinuities.

Applications in Oil Cleaning and Lubrication

Beyond its use in inspection applications, the E-59 is recognized for its high efficiency in removing lubricating oil from engine blocks, mechanical parts, and impregnated surfaces. This versatility makes the product an ally in sectors that deal with high levels of oil contamination, such as engine rebuilding shops, heavy maintenance, and railway industries.

Use in Grinding Shops and the Railway Sector

Engine rebuilding companies use E-59 for the precise cleaning of engines and components, ensuring that the reassembly process occurs under ideal conditions. In the railway sector, especially in locomotive manufacturing companies, the product stands out for its ability to remove oil residue from large and complex parts, where cleanliness is critical for the reliability and durability of the equipment.

Advantages of the E-59

• High performance aliphatic solvent.
• Ideal for surface preparation in non-destructive testing.
• Excellent removal of lubricating oil and grease.
• Widely used in engine rebuilding shops and locomotive companies.
• Versatility: suitable for industrial maintenance, inspection, and heavy-duty cleaning.

E-59 is not just a solvent. It represents a practical and reliable solution for sectors that demand deep cleaning and precision in non-destructive testing. Whether in engines, industrial parts, or large railway systems, its application guarantees efficiency, safety, and reliability in day-to-day maintenance.

Want to learn more about the E-59 and its applications? Talk to our team !

Read also: High-Quality Industrial Inspections Begin with a Clean Surface

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