Bad Stuff Out We recently had a request from a customer who wanted to know how he could be sure that our solvent remover contained no chromates, since this seemed to be a requirement of NADCAP. We advised him that one could n...
The thermally cracked aluminum panel was an early method of comparing the sensitivity of one penetrant to another, and was written into the first issue of MIL-I-25135. At that time there was apparently no concept for a specif...
Time Flying and Some Perspective on Qualification Documents It is an interesting question – Is penetrant inspection a new technology or an old one? For newcomers, it probably is old. But some old timers can still remember the...
It is always interesting to see what issues of “The Penetrant Professor” stirs response from the readers. The January 2016 issue, which dealt with the history of the specification for qualification of penetrants prompted nume...
The Penetrant Professor has always tried to give answers, to the many questions that come to Met-LChek, based on years of hands on experience, and scientific experiments. Without a doubt the most frequently asked question is,...
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 underst...
Does using aged penetrant materials reduce the likelihood of detecting fatigue cracks? There is a body of research going on at a couple of places that have to do with penetrant inspection. At Sandia laboratories, the followin...
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 ...
In October 2015 Bill Mooz, President of Met-L-Chek, gave a talk at the Fall ASNT Conference in Salt Lake City, Utah. Bill has been closely involved with the development of the specifications govern- ing penetrant inspection m...
We are getting phone calls asking why we do not use ASTM D 95 to measure the water content of penetrants and emulsifiers. ASTM E 1417 & NADCAP PRI AC7114/1 revision A, allow the use of ASTM D 95 or the modified Karl Fisch...
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