• A single one pound container of Magnaflux 20B
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Magnaflux

20B Wet Method Fluorescent Particles

20B Wet Method Fluorescent Particles

SKU: 01-0179-57

Stock Status: In stock
$69.95
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Magnaflux MAGNAGLO 20B Preblended Dry Mix Fluorescent Particles

20B is a highly sensitive dry magnetic particle premix designed for locating fine discontinuities in high volume applications. This exceptional formulation combines Magnaflux’s industry-leading 14A magnetic particles with water conditioners, creating an easy-to-use premix for water-based magnetic particle suspension. The ultra-sensitive particles yield clear, bright, fluorescent green indications under ultra-violet black light, ensuring unparalleled inspection quality and accuracy.

As a dry mix of 14A with wetting agents and corrosion inhibitors, 20B is added to a water bath for effective flaw detection. The indications of defects manifest as a bright yellow-green hue under ultraviolet light, allowing for easy identification. The 20B water-bath is applied to parts during magnetization and then inspected, making it suitable for detecting cracks, seams, inclusions, laps, tears, and flakes. It effectively identifies flaws that are open to the surface or slightly subsurface in various ferromagnetic materials, including steel and iron alloys.

Benefits
  • Premix powder for quick, reliable bath preparation
  • Clear, bright indications under ultra-violet light
  • High sensitivity for precise detection
  • Strong corrosion protection
  • Non-foaming for ease of use
  • Simple post-testing cleanup
  • Excellent fluorescent contrast for rapid identification
  • Enhanced particle mobility and dispersion stability
  • Good surface wetting properties

Use Recommendations

NDT Method: Magnetic Particle Testing, Fluorescent, Wet Method

Suspension Vehicle: Water

Required Equipment: Magnetizing device, UV light source

Temperature Range: 32 to 120°F / 0 to 49°C

 

Magnaflux 20B – Product FAQ

What is Magnaflux 20B?

Magnaflux 20B is a fluorescent magnetic particle premix powder designed for detecting fine discontinuities in ferromagnetic materials during non-destructive testing (NDT).

What is 20B used for?

20B is ideal for:

  • High-volume inspections in forging, casting, stamping, and welding
  • In-process and in-service inspections
  • Detecting surface and slightly subsurface defects

What are the benefits of using 20B?

  • High sensitivity – Uses Magnaflux 14A particles for enhanced detection
  • Fast inspections – Clear, bright indications with minimal background
  • Reliable results – Durable particles resist clumping and maintain consistency
  • User-friendly – Easy premix with corrosion inhibitors and wetting agents

What materials can be tested with 20B?

  • Steel
  • Iron alloys
  • Nickel alloys

What types of defects can 20B detect?

  • Inclusions, seams, laps, and flakes
  • Shrinkage, quenching, fatigue, and grinding cracks
  • Tears and welding defects

How do I prepare 20B for use?

  1. Mix 1.5 oz per gallon (or 11.2 g per liter) of water
  2. Create a thick paste with a small amount of water
  3. Add paste to tank and mix for at least 15 minutes
  4. Use warm water (100°F / 38°C) for faster mixing

Note: Do not mix with oil-based carriers.

How is 20B applied during testing?

Use a magnetizing device and UV light. Apply the suspension by spraying or flooding, and inspect under a black light. Keep the bath well mixed during use.

How do I maintain suspension quality?

Check particle concentration daily using an ASTM-compliant centrifuge tube (e.g., Magnaflux 8493). Replace suspension if contaminated or heavily used.

How is cleanup handled after testing?

  • Demagnetize parts before cleaning to ease particle removal
  • Apply a temporary protective film if extended corrosion protection is needed

How should I store 20B?

  • Store in a cool (50–86°F / 10–30°C), dry place
  • Keep away from magnetizing equipment, heat, and sunlight
  • Seal containers tightly to prevent moisture absorption

What packaging options are available?

  • 1 lb (453 g) jar – Case of 6 (Part #: 01-0179-71)
  • 15 lb (6.8 kg) pail (Part #: 01-0179-70)
  • 30 lb (13.6 kg) pail (Part #: 01-0179-84)

What standards does 20B comply with?

  • AMS 3044
  • ASTM E709 & E1444
  • ASME
  • MIL-STD-2132 & 271
  • NAVSEA 250-1500-1 & T9074-AS-GIB-010/271

Defect location: surface and slightly subsurface

Ideal for:

  • Detecting fine discontinuities
  • Smooth surface finish
  • High volume testing
  • After secondary processing
  • In-service inspections
  • Castings
  • Forging
  • Stamped parts
  • Ferromagnetic metals
  • Steel
  • Iron alloys
  • Nickel alloys

Defect examples:

  • Inclusions
  • Seams
  • Shrink cracks
  • Tears
  • Laps
  • Flakes
  • Weld defects
  • Grinding cracks
  • Quenching cracks
  • Fatigue cracks

Specifications

  • AMS 3044
  • ASTM E709
  • ASTM E1444
  • ASME
  • MIL-STD-2132
  • MIL-STD-271
  • NAVSEA 250-1500-1
  • NAVSEA T9074-AS-GIB-010/271

PREPARATION INSTRUCTIONS

Mix 20B with water for use. Fill tank or container with water. Measure or weigh out 20B, add a small amount of water and mix to form a thick paste. Add the paste to water in the tank or container. Mix for a minimum of 15 minutes, until the particles are completely and evenly dispersed in the suspension. Check concentration before use. Using warm water (100°F / 38°C) to prepare the suspension will help the 20B mix faster. Do not mix 20B with petroleum distillate (oil). A measuring scoop is included with container of 20B. The scoop measures enough 20B powder for one gallon of water.

INSTRUCTIONS FOR USE

Use 20B with appropriate magnetization procedure and equipment. For best results, all components, parts, or areas to be tested should be clean and dry prior to testing to provide an optimal test surface and reduce particle suspension contamination. Particle suspension must be properly mixed and continuously agitated when in use to ensure uniformity and concentration. The suspension can be applied by gently spraying or flooding the area to be tested using the continuous or residual application method. Inspect under ultra-violet black light. Check particle concentration before use.

Maintenance Recommendations

Magnetic particle suspensions need to be properly maintained to provide consistent results. Suspension concentration and contamination should be monitored at least once a day, or according to applicable specifications. Contaminated suspensions, or those in use for an extended length of time, should be replaced. Properly cleaning all components, parts, or inspection areas before testing helps to significantly reduce particle suspension contamination. Particle concentration should be determined after initial bath preparation and at least once a day, or according to applicable specifications, to maintain the proper level of particles in the suspension. The most widely used method of control is by settling volume measurement in a graduated ASTM pear-shaped centrifuge tube. For testing 20B, Magnaflux centrifuge tube 8493 is recommended: 100 ml capacity, stem graduated from 0 to 1 mL in 0.05 mL increments.

REMOVAL

All components, parts, or inspection areas must be properly demagnetized before cleaning to ensure easy particle removal. Cleaned parts may be treated with a temporary film protective coating if longer corrosion protection is required.

STORAGE

Store in a well-ventilated area away from magnetizing equipment and heat sources. Product age, exposure to elevated temperatures, and/or exposure to a strong magnetic field may adversely affect particle redistribution. Protect from sunlight. 20B is a hygroscopic (moisture absorbing) powder so storage containers should be tightly sealed when not in use. Cool, dry storage location is preferred. Refer to Safety Data Sheet for additional storage instructions.

Safety Data Sheet Product Data Sheet