... carbide 1.Gas Yeild:more than 295L/KG min 2.Size:1-4mm,4-7mm,4-15mm,7-15mm,15-25mm ... ,50-80mm,70-100mm,80-120mm Calcium carbideGas yeild(quality standard): ITEM INDEX Special Grade Gas yield (20°C 101.3KPa ... .08 H2S%(v/v) ≤ 0.10 The mass fraction of particle size(5~80mm)/% ≥ 85The mass fraction of screen under material (2 ...