väljafiltreeruva pulbriga kapillaarkatse läbiviimine pragude määramiseks poorsetes materjalides (vt filtreerpulberkapillaarkatse), a penetrant method for non-destructive testing based on the filtering out and concentrating of particles on surface, as liquid flows into the cracks; used to locate cracks open to the surface in porous materials (see: filtered particle penetrant test)