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

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