... , N2O,SIF4 HE BF3,CO, C3H6, SF6, CH4 ,CL2 South China Specialty Gas is a leading specialty gas companies in ... are nearly900 employees working in 12 subsidiaries across China mainland, and two overseas subsidiaries in Canada and Hong Kong. ... We are enjoying the benefit of fast-growing China economy; meantime we export products to Vietnam, Pakistan, Thailand, Indonesia ...