Penetrant Inspection

Water Content

ASTM E-1417 requires that the water content of in-use water washable penetrants and lipophilic emulsifiers be less than 5 percent. The listed analytical methods for measuring this percentage are ASTM D-95 and a modified Karl Fischer method described in ASTM E-1417 Annex 1. We recently received an inquiry as to...

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Mixing Batches and Re-filling a Penetrant Tank

We do not know to what extent this subject is a problem for anyone in the USA, but it seems to have come up in Europe. There is a lot of common sense involved in this subject, and probably most, if not all, of our readers will agree with that....

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Penetrant Tank Contamination

Here again, there is a lot of common sense involved. One should simply see that junk- oops, foreign material – does not get into the penetrant. But it does happen. There is the obvious poor practice of people throwing stuff into the tank. We are told that tanks have been...

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Emulsifier Make-Up and Dilution

There is a bit of turmoil concerning hydrophilic emulsifiers that we had tried to address by providing a concentration chart in our literature, and subsequently we added this to the labels on the containers. But, then there were claims that this might not be applicable to all batches. So, then...

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Can you add an additive to a penetrant?

Another faithful reader and customer asked if there was an additive that could be used to facilitate the electrostatic spraying of penetrant. While the question was innocently made, the person either forget or did not understand that the penetrant in use was a QPL approved material under AMS-2644. As such,...

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Aerosol Spraying and Spraying Technology

AEROSOL SPRAYING Almost every inspector understands that in order to get good penetrant indications, it is necessary to apply a thin coating of developer. This is particularly true when the inspector uses form “d” nonaqueous aerosol developer. We often get questions about other methods of applying form “d” developer, for...

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