CALCIUM CARBIDE SIZE: 25-50MM/50-80MM/80-120MM GAS YIELD: 295 L/KG MIN. H2S: 0.15% MAX PH3: 0.10% MAX PACKING:IN 100KG NET / 106KG GROSS NEW STEEL DRUM FILLED WITH NITROGEN GAS. ORIGIN: CHINA BRAND: ERDOS SHUANGXIN Product Name: Calcium carbide Other Name: Calcium carbide (Ca(C2));Acetylenogen;Calcium acetylide (Ca(C2));Calcium dicarbide;Calcium carbide;Calcium acetylide;Ethyne,calcium CAS No.: 75-20-7 UN No.: 1402 Molecular Formula: C2Ca Molecular Weight: 64.1 Exact Mass: 64.1 HScode: 28491000 Propertics: It is a gray, yellow and brown or black solid,and its density is 2.22 g/cm3. It will lose luster and appear gray because of absorbing moisture in the air.