Item

Grade B

Grade A

Main Content (on SrCO3 basis)

99% min

99.5%

Ca

0.05% max

0.03% max

Ba

0.05% max

0.03% max

Cl

0.02% max

0.001% max

Na

0.01% max

0.01% max

Fe

0.005% max

0.0005% max

SO4

0.05% max

0.01% max

Fe2O3

0.002% max

0.001% max

SiO2

0.04% max

Insoluble Matter In HCI

0.1% max

0.01% max

Heavy Metals (on Pb basis)

0.001% max