Products

Executive standard: GB/T1276-1999

Item

Index  

Guaranteed reagent

Analytical grade

Chemical pure

Content (NH4F)          ％≥               

96.0

96.0

95.0

Clarity test

Qualified

Qualified

Qualified

Ignition residue (Sulfate) ％≤

0.005

0.02

0.05

Free acid (NH4HF2) ％≤

0.2

0.5

1.0

Free alkali

Qualified

Qualified

Qualified

Fluoride (Cl)         ％≤

0.0005

0.005

0.01

Sulfate (SO4),   ％≤

0.005

0.01

0.02

Fluosilicate，          ％ ≤ 

0.08

0.30

0.60

Iron (Fe),            ％ ≤    

0.0005

0.002

0.004

Heavy metal (Pb),  ％ ≤  

0.0005

0.001

0.002