Our fiber cement board length 2.4 m, 2.44 m, 3 ... , ISO 9001-2000, ISO14001-2004. Middle density fiber cement board:The mail raw materials are cellulose fiber, quartz sand ... and Portland cement. These materials are mixed together with water and additives, ... 0.3IncombustibilityIncombustibility Class A according to GB8624 Fiber cement board (CE approved)