Description of the problem:

About calcium carbide index and particle size distribution: What are the indexes? What is the standard for export? thank you !

analysis:

the particle size of calcium carbide can be determined according to requirements. The quality of its products complies with the standard of GB16665-1997 (People's Republic of China and Ministry of Chemical Industry, 1997). For details, see Table

Product Quality Summary Table

Item indicates

First-class products

Gas generation rate L/kg≥(2℃, 11.3Kpa) particle size mm 8-2 35 285 255

5-8 35 285 255

5-8 3 28 25

5-5 3 28 25

phosphine (PH3)% (v/v) in acetylene.