Executive standard:GB28655-2012

Item

Index

Superior product

First-class product

Qualified product

Ammonium bifluoride (NH4HF2) (dry basis) w/%         ≥

98.0

97.0

96.0

Ammonium fluosilicate[ (NH4) 2SiF6]w/%                 ≤

0.5

1.5

3.0

Drying loss w/%                             ≤

1.5

3.0

4.0

Ignition residue w /%                             ≤

0.1

0.2

——

Sulfate (SO4) w/%                    ≤

0.1

0.1

——