If you need Calcite Powder for the manufacturing of Plastics, Paints, and Coatings, we recommend Grade 1 (96% Purity) Calcite Powder (2 - 5 microns). For Paper and alternative Plastics, we recommend Grade 2 (94% Purity) Calcite Powder (10 microns). For refined Paper, Rubber Processing and Adhesives, Grade 3 Calcite Powder of 92% Purity and 15 microns is the best. For Cement and Building Construction materials, Grade 4 Calcite Powder (90% Purity) of 20 micron is used.