Purity ( counted as CaCO₃)        

≥ 98.0

Acid Insoluble Matter            

≤ 0.20

Settlement bulk               

≥2.5

Loss on Drying               

≤ 1.0

PH (10% suspension)                                   

8.0-10.5

whiteness       

≥90.0

Residue (325 mesh)      

≤ 0.5

Manganese           

≤0.008

Free alkalinity

≤0.1

Average particle size

≤1.9um

Heavy metal

≤0.002%