Our company is one of the largest manufacturer and exporter of caustic soda and calcium carbide in china.outlet of caustic soda(flakesolidpearl)can up to 40000 tons per year and our company produce 2000tons of calcium carbide per year.following is our standard spec: caustic soda:flakes 96% 98% 99% pearls 99% solid 96% 99% packing: 25kg plastic bag calcium carbide gas yield:285l/kg 295l/kg 305l/kg granulanty:25-50mm 50-80mm 100-120mm packing: 100 iron drum please see our website( www.tiankaichem.com ) to get more information about our company. We are ready to serve for you anytime.. if you want good quality and lower price never hesitate to contact me!