Met-L-Chek Company manufactures a complete line of penetrants used in the fluorescent (Type 1) and visible  (Type 2) dye penetrant inspection process. All Met-L-Chek Company penetrants are qualified to AMS-2644 and  are sold under the Met-L-Chek® and Pen-Chek® trademarks. Met-L-Chek Company products are manufactured  under license in The Netherlands by NDT Europa. FP-923 is approved to AMS-2644 as a fluorescent (Type 1); Methods “A”, and “C”; sensitivity level 3 water  washable inspection penetrant. For Method “C” applications it is used with E-59, E-59A, R-503, and R-504.  FP-923 is applied by immersion, spray, or wipe on. It is approved for high sensitivity aerospace applications.  FP-923 is listed on the Qualified Products List for AMS-2644. It meets the requirements of AMS- 2647, ASME Boiler and Pressure Vessel Code Section V, ASTM E-165, and ASTM E-1417, for penetrant inspection materials. It is low in sulfur and halogens and is safe for use on all metal surfaces.

Typical Physical Properties 

Form: clear yellow green liquid 

Density: 918 g/L Flash Point: > 93˚C (> 200˚F)

Viscosity 11.3 mm2 /s Water Tolerance:> 10 % 

Water Content: < 1 % 

Fluorescent Brightness: (AMS-2644 requirement > 90 %) 117.7% 

Corrosion of aluminum: none Corrosion of carbon steel: none Corrosion of magnesium: none Corrosion of stainless steel: none Corrosion of titanium: 

none Chloride content: < 100 ppm (0.01%) 

Fluoride content: < 50 ppm (0.005%) 

Sodium content: < 100 ppm (0.01%) Sulfur content: < 100 ppm (0.01%) 

Mercury: none VOC’s: 0 g/L 

Ozone layer depleting substances: none PCB’s: none