Quality index Index Ingredients Grade HF % ≥ H2O % ≤ SO2 % ≤ Involatile acid(as H2SO4) % ≤ H2SIF6 % ≤ Premium grade 99.98 0.01 0.001 0.003 0.006 Top grade 99.95 0.03 0.007 0.005 0.010 First grade 99.90 0.06 0.015 0.020 0.020 Qualified product 99.70 0.10 0.030 0.050 0.050
HF % ≥
H2O % ≤
SO2 % ≤
Involatile acid(as H2SO4) % ≤
H2SIF6 % ≤
Premium grade
99.98
0.01
0.001
0.003
0.006
Top grade
99.95
0.03
0.007
0.005
0.010
First grade
99.90
0.06
0.015
0.020
Qualified product
99.70
0.10
0.030
0.050
