Quality index

Grade Top grade First grade Qualified product Product name Ingredients HF30-45 HF50-70 HF30-45 HF50-70 HF30-45 HF50-70 HF % ≥ 30-45 50-70 30-45 50-70 30-45 50-70 H2SIF6%≤ 0.02 0.02 0.2 0.5 2.5 5.0 Involatile acid (as H2SO4)%≤ 0.02 0.05 0.05 0.08 1.0 2.0