GB/T2899-2008Barium Sulphate Content %≥98.01050C Volatile matter%≤0.15Water solubles content%≤0.20Fe content %≤0.002Whitness %≥97Oil absorption g/100g: 10-30PH-value of aqueous suspension 100g/l :6.5-9.0Degree of fineness（45um test）%≤0.10Particle size distribution 325 mesh