Use vacuum impregnation with a low-viscosity epoxy to fill open pores, which helps prevent edge rounding and pull-outs.
Voids act as thermal and electrical insulators, altering the expected physical properties of the component. astm e2109-01 pdf
ASTM standards are protected by copyright and typically require purchase. You can obtain the official PDF from these authorized sources: Use vacuum impregnation with a low-viscosity epoxy to
Proper magnification levels to capture representative fields of view. astm e2109-01 pdf