Combining Magnaflux’s best-in-industry 14A magnetic particles, corrosion inhibitors and wetting agents, 20B is an easy-to-use premix for making magnetic particle water bath. The ultra-sensitive 14A particles provide clear, bright, fluorescent green indications under ultra-violet black light for unbeatable inspection quality and accuracy, and the water conditioners provide corrosion protection and complete surface wetting.
20B is a great choice for baths which need to be changed out frequently due to drag-in or heavy-use and is ideal for in-process testing to detect cracks, seams, inclusions, laps, tears and flakes.
20B meets all major industry and NDT specification requirements, including automotive, API and ASTM standards.
APPLICATIONS: 20B is used to locate fine surface and slightly subsurface discontinuities such as: inclusions, seams, shrink cracks, tears, laps, flakes, welding defects, grinding cracks, quenching cracks and fatigue cracks.
COMPOSITION: 20B is a dry mix composed of 14A fluorescent powder and WA-2B water conditioner (contains wetting agents and corrosion inhibitors) in a dry mix formula. This product is added to a water bath.
TYPICAL PROPERTIES (Not a specification)
|Color Under White Light||Brown|
|Color Under Black Light||Yellow-Green|
|Mean Particle Size||6 Microns|
|SAE Sensitivity||0.20 - 0.35 ml|
|Temperature Limit||120?F Maximum|
20B: A measuring scoop is included with each 20B container. The scoop measures enough 20B particles for one gallon of water. Weigh out (1.5 oz. 20B /gallon of water), or measure out 20B using scoop, and add to water with agitation. Add directly over sump on Magnaflux® Magnetic Particle units for rapid dispersion. The use of warm water (100?F) will increase the rate of dispersion. Allow the bath to agitate for 30 minutes before testing concentration.
METHOD OF APPLICATION: 20B: Parts should be cleaned prior to testing to reduce bath contamination and to ensure a more desirable test surface. The bath must be continuously agitated when in use to ensure uniformity, as particles will settle out of suspension on standing.
Using the wet continuous method, the bath is applied to all surfaces of the part. The instant the bath stream is removed from the part the magnetizing current is applied. The indications will be formed during the current shot. If the bath is applied after the magnetizing shot, the force of the bath application may wash away indications.
Using the wet residual method,the pre-magnetized part (must be of high retentivity) is immersed in the bath and then removed and allowed to drain. The indications will be formed in the bath but background will be reduced during the drain. This method is generally less sensitive than the continuous method. The bath is also more susceptible to rapid particle depletion and contamination using this method.
POST INSPECTION CLEANING: The parts must be properly demagnetized before cleaning to ensure ease of particle removal.
SPECIFICATION COMPLIANCE: 20B: ASTM E 1444, ASME B & PV Code, Sec. V, NAVSEA 250-1500-1, ASTM E-709 (E-138), MIL-STD-271, AMS-3044, MIL-STD-2132.
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