SS-P-821B, FEDERAL SPECIFICATION: Pumice; Ground, Abrasive (17-AUG-1966) [No S/S Document]
SS-P-821B, FEDERAL SPECIFICATION: Pumice; Ground, Abrasive (17-AUG-1966) [No S/S Document]., This specification covers one type of ground abrasive pumice for general polishing and finishing use.