Classification Carbonate Type Calcium Carbonate CAS No. 75-20-7 Other Names calcium acetylide MF CaC2 EINECS No. 200-848-3 Place of Origin Tianjin, China (Mainland) Grade Standard Food Grade, Industrial Grade Purity 295 GAS YIELD MIN Appearance Dark Brown lump Application used in producing acetylene gas Brand Name YMS Model Number 295 grade Appearance dark ,brown lump