... ,80-120mm, etc Gas Yield: 305 l/kg, 295 l/kg, 285 l/kg. Package: 50/100/250KG Product Specifications Standard for Calcium Carbide ... : GB10665-2004 (condition: 20°C, under atmospheric pressure) GradeBestFirst-AFirst-BQualifiedGas Yield <L ... .1≤0.1≤0.1≤0.15Grain 25/50/80/12025/50/80/12025/50/80/12025/50/80/120 Calcium Carbide(CaC2)