... pipe 4 have stock Acid-and Heat-Resistant Bricks,Boards&Pipes is thespecial ceramic bricks which can resist high temperature,thermal ... and chemical.Specification of Acid and Heat Resistant Bricks,Boards&Pipes ItemUnitIndexRemarkSpecific gravityg/cm³2.21—2.24ASTMHole fracton%9.3 ... rate%0.31DINAcid resistance%99.8DIN Acid and Heat-resistant Pipes