n (barites, blanc fixe, heavy spar, permanent white, terra ponderosa) BaSO4. A white powder obtained from the mineral barite or synthesized chemically. One of the synthetic varieties, blanc fixe, is made by mixing aqueous solutions containing sulfate and barium ions. As a filler in plastics and rubbers, barium sulfate imparts opacity to X rays but only a low order of optical opacity. Thus it is useful as a filler when it is desired to increase specific gravity without adversely affecting the tinctorial power of pigments. (Ash M, Ash I (1998) Handbook of fillers, extenders and dilutents. Synapse Informtion Resources, Inc., New York).
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Gooch, J.W. (2011). Barium Sulfates. In: Gooch, J.W. (eds) Encyclopedic Dictionary of Polymers. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-6247-8_1076
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