Liquid Penetrant Examination

Ultratest is the leading specialist in liquid penetrant inspections on a wide range of materials and products.

Liquid penetrant testing is yet another form of non destructive testing used for finding surface defects only.
It is the most commonly used low-cost inspection technique for detecting surface-breaking defects in all non-porous materials.
Penetrant testing is a physical and chemical test used for detecting and making visible to the naked eye, surface related discontinuities in non-porous metals.
Solvent removable penetrant is the most common application.  Evaluation is made with white ambient light.
Water washable penetrant is a rapid and effective means of inspecting large areas or in locations where the solvent would have an injurious effect upon the material or personnel.  The inspection is usually made with white light.
 
Fluorescent penetrant removable by both solvent and water and with evaluation made under ultraviolet light is the most sensitive of the penetrant methods for inspection.  A darkened environment is necessary for inspection under the black light.