Liquid Penetrant Testing
Liquid Penetrant Inspection (LPI) is used to locate defects that exist in the surface of any non-porous material including ceramics, plastics, and metals. LPI will work very well on a large variety of materials, including metallic, nonmetallic, magnetic, nonmagnetic, conductive, and non-conductive surfaces such as stainless steel.
LPI is an inexpensive, highly portable method for detecting surface cracks and discontinuities. With the advantages of not requiring a power source or any large pieces of equipment, LPI can be used where many other techniques could not.