Quality: (according to GOST 10561-80. high grade KA) Origin China Russia Property Range F 54 % min 53% min 54% min Al 18 % max 13% min 19% max Na 23% min 32% max 22% min Cryolite, modulus 1.7% min 1.5% min SiO2 0.5% max 0.4% max 0.9% max F?H 0.06% max 0.15% max 0.08% max S0 4 0,5% max 0.5% max 1% max H 2 O 0.2% max 0.5% max 0.5% max P 2 0 5 0.05% max 0.02% max 0.2% max