Content (SrSO4),%                       ≥

99.0

Barium sulfate (BaSO4),%                 ≤

0.1

Calcium sulfate(CaSO4),%               ≤

0.08

Calcium oxide(CaO),%                 ≤

0.05

Ferrum (Fe) ,%                         ≤

0.01

Chloride (Cl) ,%                       ≤

0.01

Sodium (Na) ,%                       ≤

0.008

Potassium (K) ,%                       ≤

0.005