Calcium carbide 50 80mm best quality ;Gas yield: 295L/kg min In 50/100kg drum; Size: 4-7mm,7-15mm,15-25mm.25-50mm,50-80mm, calcium carbide 50 80mm Applicantion: This product is lumpy substance, its surface is a little deep gray, has slight nasty smell. It can produce acetylene gas when met water, it can burn when meets fire. The acetylene gas mix with air will form explosive gas (explosive range ...