... used as filling compound for various plastic, natural/synthetic rubber produc Heavy& Ground CaCo3 which can reduce cost of ... according to ISO9001 Certificate of international quality management system,It is an all-purpose filler materials due to ... ≤38Activation, % ≥---AppearancePOWDER3.Main Applicantion:It is widely used in paper-making,plastic,rubber,paint,building material,etc. Mesh 600 Natural ...