filtered-particle testing

filtered-particle testing

[¦fil·tərd ¦pärd·ə·kəl ‚test·iŋ]
(engineering)
A penetrant method of nondestructive testing by which cracks in porous objects (100 mesh or smaller) are indicated: a fluid containing suspended particles is sprayed on a test object; if a crack exists, particles are filtered out and concentrate at the surface as liquid flows into the crack.