... 3.Moisture:0.1% 4.Insolubles:0.3max heavy calcium carbonate powder in rubber1.useage:as the filling in the rubber to ... hardness,rigidity,size ,stability,fire-retardantness,glossiness of products4) Calcium carbonate is used for highpolymer material to improve the craftwork ... making rubber,plastic,paper,paint,printing etc.9.process:selects high purity limestone as raw material,then grind use machinery.It ...