LIQUID PENETRANT TESTING (PT)
Liquid Penetrant Testing (LPT) is used to detect surface-breaking
defects in ferrous, non-ferrous materials and all non-porous
materials (metals, plastics or ceramics).
The process involves applying a liquid penetrant to the surface of
the material, allowing it to seep into any discontinuity such as
cracks, porosity, laps, seams and other surface discontinuities.
After a specified dwell time, the excess penetrant is removed, and a
developer is applied. The developer draws back the penetrant out
of the defects, making visible indication on the surface under
appropriate lighting conditions.
