... ,chemical,papermaking etc. Limestone Powder and lump for PVC Application: 200mesh: as the additive in the feed 250-300mesh: whitewash the wall,plastic,rubber,waterproof material ... ,drying and depolymerization.It is adopted the technics of particular multi-selection and secondary depolymerization.2.feature:poison free,odour free,high purity,high heat ...