Calprec PR-2E Coated Precipitated Calcium Carbonate Cales de Llierca Extenders / Fillers >> Calcium Carbonate, precipitated Rheology Modifiers / Thickeners >> Mineral >> Precipitated calcium cabonate Acid Absorber / Acceptor SEALANT Calprec PR-2E is a ultrafine coated precipitated calcium carbonate. Its main properties are: high purity, narrow crystal size distribution in the nanometric range, and organic surface treatment. Low fatty acid content. Rheology modifier filler in sealants. Ultrafine coated precipitated calcium carbonate. Used as rheology modifier filler in sealants. Possesses high purity, narrow crystal size distribution in the nanometric range, and organic surface treatment. Has low fatty acid content.