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F-4S(NT)
F-4A/1water washable penetrant is a low sensitivity penetrant (Level 1) that features excellent wash ability. It is designed for use on rough or unmachined surfaces such as castings and forgings to find larger discontinuities in non-safety critical components. It is ideal for inspecting automotive and general industrial components such as engine cylinder blocks, power train components, rocker arms, pistons, etc.
It can be developed with F-5D/1 dry powder developer, with F-4W-SP/1 Water spendable developer in an agitated tank or with F-4S(NT) or R-1S(NT)/1 non-aqueous developer. With a UV-A light source, indications will appear as a bright green-yellow fluorescence.
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