https://store.astm.org/d6225_d6225m-98r12e01.html
D6225/D6225M Standard Test Method for Granule Cover of Mineral Surfaced Roofing
standard test
https://www.astm.org/membership-participation/technical-committees/workitems/workitem-wk73681
WK73681 - Revision of D6225/D6225M-98(2020) Standard Test Method for Granule Cover of...
ASTM International - Standards Worldwide