1.CaCO3 contents: 98%min 2.Size(mesh): 325 1250 etc 3.whiteness:93min 4.Used for plastic, ... in the feed 250-300mesh: whitewash the wall,plastic,rubber,waterproof material 350-400mesh:gusset plate,chemical,pipe 400-600mesh:toothpaste and ... ,papermaking Properties:1.process:selects high purity limestone as raw material, is made through process of calcining.chemical reaction,reselection.dehydration ...