Executive standard: GB/T1278-1994

Item

Index

Analytical reagent

Chemical pure

Ammonium bifluoride content (NH4HF4)               ％     ≥

98.0

97.0

Ignition residue (Sulfate),      ％   ≤

0.01

0.05

Chloride (C1),                 ％   ≤

0.001

0.005

Sulfate (SO4)            ％    ≤

0.005

0.01

Fluosilicate (SiF6),        ％  ≤

0.2

0.5

Iron (Fe),                    ％  ≤  

0.001

0.005

Heavy metal (Pb),           ％ ≤

0.002

0.005