Index   name

Analytical   reagen( A.R )

Chemically pure reagent( C.P )

Industrial   grade

Melting   point range:

131.5   ~ 134

131 ~ 135

130 ~ 136

Water   solubility

Conform

Conform

Insoluble   substance 0.1%

Ignition   residue %≤

0.025

0.05

0.1

Chloride   (CL) %≤

0.001

0.002

 0.002

Sulfate   (SO4 ) % ≤

0.010

0.010

 0.010

Gallic   acid

Conform

Conform

pyrogallic   Acid(content)

99.8%

99.6%

99%

Fe(content)

0.35mg/kg

0.4mg/kg

0.45mg/kg

Na(content)

0.15mg/kg

0.2mg/kg

0.3mg/kg