Also known as blanc fixe, this high purity, synthetically-produced barium sulphate product acts as an extender in the production of paints, coatings and plastics. It is completely inert and possesses high resistance to outdoor exposure and other chemicals.
Barium sulfate, moreover, serves as filler (filling spar) in the plastics and the paint and varnish industries. It increases the plasticity and weight of plastic materials that are used for sound insulation in e.g., car mats, carpet coatings, or plastic sewage pipes. The chemical inertness and high temperature stability of barium sulfate are made use of in friction linings. Clutch and brake linings, for example, may contain up to 40 % barium sulfate.