We frequently get questions concerning the shelf life of our products. Shelf life is a term that can be defined differently by different manufacturers, and we explain what is the practice for Met-L-Chek. This information is a...
We get a wide range of questions, from the sublime to the ridiculous. But we always understand that the question, no matter how “far out” it might seem, is an important one for the person who has asked it, and we treat it tha...
Hydrophilic Emulsifier We probably do not say enough times that the subjects that are addressed in this publication originate with those folks who use penetrants. The last issue featured information about hydrophilic emulsifi...
Is Water Washable The Same As Water Based? We recently had a customer call who was being pressed by an auditor to prove that the level 3 water washable penetrant he was using, (Met-L-Chek FP-923), was not a water-based penetr...
What Is The Smallest Crack You Can Find? The proof of the pudding that this newsletter is driven by its readers is much more obvious to us than perhaps to the readers. But a sterling example has just occurred, as a reaction t...
One of the services that Met-LChek provides to the NDT community is the writing, updating and editing of the various specifications and procedures related to penetrant inspection. This includes the ASNT Penetrant Handbook, wh...
Penetrant Application & Sensitivity How is the best way to apply penetrant, and does the method of application have any bearing on the sensitivity of the process? This is a question that arises from time to time. It is no...
How Much is Enough? We often get this question. A person will phone and ask about how much penetrant (or remover or developer) will be required for a job that needs to be inspected. Often the person does not have any data abo...
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 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,...
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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