... whiteness:93min 4.Used for plastic,rubber,chemical,papermaking etc. Limestone Powder and lump for PVC Application: 200mesh: as ... ,waterproof material 350-400mesh:gusset plate,chemical,pipe 400-600mesh:toothpaste and soap 800mesh:rubber,pvc,plastic,electric ... material, is made through process of calcining.chemical reaction,reselection.dehydration,drying and depolymerization.It is adopted the technics of ...