Voids formed during solidification, often appearing more irregular than gas holes.
For digital radiography, professionals must refer to ASTM E2422 (aluminum) or ASTM E2869 (magnesium) rather than the physical films of E155. Porosity and Discontinuity Types astm e155 porosity levels pdf repack
E155 Standard Reference Radiographs for Inspection ... - ASTM Voids formed during solidification