Precipitated calcium carbonate, CALPREC® PR, is used as a rheology modifier in a variety of sealants, especially in the formulations of PVC plastisols which are applied in the automotive industry. CALPREC® PR is also used in other sealant formulations such as: Polyurethane, MS polymers, polysulphide, epoxy, etc. and as a chemical additive to add properties the most notable being thixotropy.