English name: Calcium carbide
Molecular formula: CaC2

Physical character:
Industrial products is gray, snuff color or black solid , contain higher of calcium carbide is purple. New fracture of calcium carbide has luster, reveal in the air to lose lustre show offwhite because of the calcium carbide imbibe moisture. Relative density 2.22 (18 centigrade). Industrial product calcium carbide content 80%. Melting point 2300 centigrade. Can conduct electricity, the higher purity , the higher conduct electricity. Chemical property is very lively , at the appropriate temperature can reaction with a lot of gas , solution. Touch with water drastic decompound and bring acetylene and calcium hydroxide, disengaging large numbers of heat. Has drastic chemical reaction with chlorine , hydrogen chloride , sulfur , phosphorus , alcohol etc. at high temperature.

Toxicity protects:
Calcium carbide powder has irritative, touch with sweat of skin generating Ca (OH) 2, burn skin, until skin fester. Suck in the body can hurt people's respiratory system. At working must wear goggle, respirator and gloves. Put out the gas of the barrel when convey and before enter the storehouse. And strictly forbid barrel roll, emphatic placed , collision , prevent from arouse spark , bringing about blast. When packing damage, strictly forbid electric welding and tin solder. Fire fighting forbid use water , only available use the sand or carbon dioxide to save, and also available use the drying sodium carbonate (soda ash powder) to save. When discover dizziness , headache or vomitus, should move to the place of air fresh immediately. Heavy person should go to hospital.