Penetrating liquids

Liquid penetrant inspection is a quick and accurate method of locating surface discontinuities such as cracks, porosity and folds in ferrous and non-ferrous materials. It is particularly suitable for parts with poor accessibility.

This type of non-destructive testing uses the ability of certain liquids to penetrate, by capillarity, into open surface defects. The low surface tension and good liquid wettability of these liquids ensure that they can penetrate even the thinnest of discontinuities.