Tianjin Xinze Fine Chemical Co.,Ltd 1. 25-50,50-80 2.Gas Yield: 295L/KG 3.Package:50kg/100kg iron drum ... :GB10666-2004Appearance: Grey, yellowish-brown ,black or brown solid blockSize:2-4mm,4-7mm,7-15mm,15-25mm,25-50mm,50 ... for iron and steel industry Calcium Carbide 20-50 50-80 295