... % SIZE 25-50MM 50-80MMUses: Used in the generation of acetylene gas for welding, and as ... , brown or black solid, purple when its purity is higher, the specific gravity is 2.22(18), melting ... , the product can absorb water in the air and conduct electricity. They higher its purity is, the easier it ... as desulfurizer and dehydrant of steel and for cutting and welding metals.Packing: 50kgs/100kgs new iron ...