FLP-1 is a special water based fluorescent penetrant concentrate designed for through leak testing and general metal working surface flaw detection.

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FLP-1 being a water based penetrant may be diluted with water to fit the inspection needs. The most common dilutions are 1:1 and 3:1, water to FLP-1. For through leak testing or to enhance hydrostatic leak detection, dilutions of 1000:1 have been used successfully. The use of developer D-70 will enhance flaw detection.

For Method C applications it is used with E-59, E-59A, R-503, and R-504.

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