... with good features of high purification and whiteness, super-micro. It is used widely for paper making, rubber, ... 5%, MgCO3:0.8%, Fe2O3:0.3% , insluble of hydrochloric acid:0.3%,Physics analyze: specific surface are :0 ... )/g, average particle size:8.0(um)--1.3(um),maximum particle size:44um-17um, whiteness:95%- ... absorption:27(ml/100g)--36(ml/100g), Moisture:0.3%, oil absorption:23(ml/100g)--31(ml/100g) ...