... gases such as CF4, NO, Xe, N2O,SIF4 HE BF3,CO, C3H6, SF6, CH4 ,CL2 South China Specialty Gas is a ... across China mainland, and two overseas subsidiaries in Canada and Hong Kong. We are enjoying the benefit of fast-growing China economy ... gases such as CF4, NO, Xe, N2O,SIF4 HE BF3,CO, C3H6, SF6, CH4 ,CL2and many other special gases. Our products ...