Penetrant Inspection

Flash Point vs Auto-Ignition Temperature

We have often looked to other NDT practitioners for input for Penetrant Professor articles. In this case we are basing the article on the newsletter put out by two knowledgeable French friends, Patrick Dubosc and Pierre Chemin. Over the years we have heard these two physical parameters being mixed up...

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Hydrophilic Emulsifier Concentration

Hydrophilic Emulsifier Concentration This subject comes up from time to time and it is time to discuss it again. The hydrophilic emulsifier is used in method D post emulsifiable penetrant inspection. It is supplied as a concentrate, and needs to be diluted with water. This is where problems can arise....

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Mixing Batches

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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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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Refractomers and Emulsifier Concentrations

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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Shelf Life

SHELF LIFE 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-LChek Company. This information is also contained in the literature on the Met-L-Chek® web site. Met-LChek...

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Tank Life

TANK LIFE Now we come to the term “Tank life”. Once the containers of Met-L-Chek Company products have been opened, shelf life no longer applies. If the product is in a tank or other container where it is used, the term “tank life” applies. For example, if a penetrant has...

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Understanding, Shades of Meaning, and Complete Obfuscation

We who work with specifications, such as ASTM E-1417, E-165, and the like are constantly reminded that it is important to be very clear. It needs to be clear to the person using the specification and it needs to be equally clear to anyone auditing the procedures. If the person...

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Hydrophilic Emulsifier

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 hydrophylic emulsifiers, and as usual, we received comments on the article. We relish receiving comments, because they come from...

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The Business of Running Lab Samples

Which Foot Is The Shoe On? One of the exciting things about being in the business of manufacturing inspection penetrants occurs at the beginning of each month. That is when many penetrant users send in their samples for our Pen-Chek® evaluation, so that they meet the requirements of ASTM E-1417...

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