Parameter

Index

Industrial Grade

Food Grade

Content

97% min

98% min

Sulphate

0.7% max

0.25% max

Water Insoluble

0.05% max

0.05% max

Chloride

0.05% max

0.014% max

As

0.005% max

5ppm max

Heavy Metals

-

20ppm max

Fluoride

0.05% max

0.005% max

PH Value

-

9.0-9.4