If you’ve already obtained this “repack,” I strongly advise scanning it for security risks and verifying its contents against an official copy before any professional use.
ASTM E155 is a standard test method for "Porosity in Aluminum and Aluminum Alloy Castings." The standard provides a series of reference images and descriptions for categorizing porosity levels in aluminum and aluminum alloy castings. astm e155 porosity levels pdf repack