Met-L-Chek P.E. Penetrants
Met-L-Chek manufactures a complete line of post emulsifiable fluorescent penetrants and emulsifiers (Type I, Methods B & D), designed to meet the requirements of virtually every inspection application. Products are available in increments of sensitivity level 1 - 4.
- All the materials are listed on the Qualified Products List for AMS-2644.
- They meet the requirements of AMS-2647, ASME Boiler and Pressure Vessel Code, ASTM E-165, and ASTM E-1417 for penetrant inspection materials.
- All meet the OSHA open tank use requirement of having Flash Points over 200 °F (93°C).
- They are low in Sulfur, Chlorine, and other Halogens, making them safe for use on Titanium and high Nickel alloys.
FP-93A(M) is approved to AMS-2644 as a fluorescent (Type 1); Methods “B”, “C”, and “D”; sensitivity level 2 post emulsifiable inspection penetrant. It is approved with Method “B” emulsifier E-57 and Method “D” emulsifier E-58D. For Method “C” applications it is used with E-59, E-59A, R-503, and R 504. FP-93A(M) is applied by immersion, spray, or wipe on. FP-93A(M) meets requirements for medium sensitivity aerospace applications. Technical Data Sheet
FP-95A(M) is approved to AMS-2644 as a fluorescent (Type 1); Methods “B”, “C”, and “D”; sensitivity level 3 post emulsifiable inspection penetrant. It is approved with Method “B” emulsifier E-57 and Method “D” emulsi- fier E-58D. For Method “C” applications it is used with E-59, E-59A, R-503, and R-504. FP-95A(M) is applied by immersion, spray, or wipe on. FP-95A(M) meets requirements for high sensitivity aerospace applications. Technical Data Sheet
FP-97A(M) is approved to AMS-2644 as a fluorescent (Type 1); Methods “B”, “C”, and “D”; sensitivity level 4 post emulsifiable inspection penetrant. It is approved with Method “B” emulsifier E-57 and Method “D” emulsifier E-58D. For Method “C” applications it is used with E-59, E-59A, R-503, and R 504. FP-97A(M) is applied by immersion, spray, or wipe on. FP-97A(M) meets requirements for ultra-high sensitivity aerospace applications. Technical Data Sheet
In view of the fact that the penetrant and emulsifier are qualified to the AMS-2644 specification together, it means that they must be used as a family of materials. Method B ( lipophilic ) employs E-57 as the emulsifier and Method D ( hydrophilic ) uses E-58D at a concentration of 17-20 % in water. Most aerospace OEM's use or recommend use of Method D.
Met-L-Chek's level 2, 3, & 4 Method D materials are approved by GE, Pratt & Whitney, and Rolls-Royce turbine engine groups.
The key processing differences between the two approaches are in the emulsification techniques. When using Method B the penetrant covered part is immersed in the emulsifier, removed, and allowed to drain for a specified time before the part is washed. For Method D the penetrant covered part is given a short water pre-rinse, then immersed in the diluted emulsifier for a specified time, removed and washed. The Method D emulsifier bath is generally under gentle agitation during the immersion step. The Method D emulsifier may also be applied as a spray remover, in which case the water pre-rinse is not generally required.
Although Met-L-Chek offers sensitivity levels 1-4, for most applications requiring level 1 and 2 it is generally recommended that water washable penetrants be used rather than the post emulsifiable process. Even level 3 water washable is recommended over methods B & D for everything except critical high stress or rotating turbine engine components.
Cross Reference Penetrant Chart - click on the links for more information
