So I haven't posted in the last couple of weeks. I've been busy working on a few different things. One, I've been writing content having to do with liquid penetrant testing I'm getting ready to do a presentation on that.
In the meantime did you all know that all penetrates are pretty much the same. They're all solvent removable penetrants. Water washable penetrant is a solvent removable penetrant that has an emulsifier added to it. That makes it so you can rinse it off with just water. You can use solvent as well. Whereas post emulsified penetrants are also solvent removable penetrants. The difference being that they have not had an emulsifier added to them. Which means that water won't remove them by itself. You either have to use a solvent wipe or you have to get a emulsifier to apply to it. Time how long the emulsifiers in contact with the penetrant and then use a water rinse to remove the excess penetrant. Too much time and you'll remove too much penetrant. It'll take penetrant right out of the discontinuities you're looking for. Not enough time and you won't remove enough penetrant and you'll have too much background to be able to find the flaws you're looking for. The nice thing about emulsifiers is after a little bit of experimentation you can determine the right amount of time and it eliminates the possibility of rinsing or removing too much of your penetrant. All penetrants start as solvent removal penetrants. A couple of advantages to solvent removable versus water washable, and post emulsified versus water washable. Is that because you have not added an emulsifier to the penetrant There's more room for dye stuff in the penetrant, which means you can get more intense colors, which makes it easier to see and can improve the sensitivity of the test.
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