Penetrant non-destructive testing method is a system that is used for the detection of cracks in the surfaces of parts.

After the material which is going to be subjected to penetrant test is pre-cleaned, it is subjected to penetrant application as dipping or spray. After this process, the material is rinsed and dried.

Powder “developer” is applied electrostatically on the dried material. Finally, possible cracks and faults on the material are detected by checking under the UV lamp.