... . H2S(V/V)≤0.1%9.Molecular weight64.10(according to 1995 international relative atomic mass)10. SIZE4-7,7- ... to avoid the spark leads to explosion.Property: Grey, brown or black solid, purple when its purity is higher, the specific gravity is ... in organic synthesis industry, Acetylene obtanied from calcium carbide is raw material to make ethylene, chloroprene rubber, calcium cyanamide, acetic acd, ...