LLL-B-810B, FEDERAL SPECIFICATION: BUILDING BOARD, (HARDBOARD) HARD PRESSED, VEGETABLE FIBER (28-SEP-1973) [S/S BY ANSI-A135.4]

LLL-B-810B, FEDERAL SPECIFICATION: BUILDING BOARD, (HARDBOARD) HARD PRESSED, VEGETABLE FIBER (28-SEP-1973) [S/S BY ANSI-A135.4]., This specification covers building board for interior and exterior use.