... 5mm Siftage, %Ash,%80-200≥85≤5≤150-80≥85≤5≤125-50≥85≤5≤14-25≥85≤5≤1Property: Grey, brown or black ... into acetylene and calcium hydroxide and releases heat.Use: Calcium carbide is an important basic material in organic synthesis industry, ... Acetylene obtained from calcium carbide is raw material to make ethylene, chloroprene rubber, calcium cyanamide ...