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Barium Sulfate
Barium sulfate is an inorganic compound, a metal sulfate, with formula BaO4S and appears as white or yellowish odorless powder or small crystals. Mp: 1580 °C (with decomposition). Density: 4.25 -4.5 g cm-3. Insoluble in water, dilute acids, alcohol. Soluble in hot concentrated sulfuric acid.
Natural barium sulfate is widely distributed in nature and occurs as the mineral “barite” (also known as barytes or heavy spar). It often associated with other metallic ores, such as fluorspar. Barites containing over 94% BaSO4 can be processed economically. It also contains silica, ferric oxide and fluoride impurities.
About 80% of the world’s barium sulfate production, mostly purified mineral, is consumed as a component of oil well drilling fluid. It increases the density of the fluid, increasing the hydrostatic pressure in the well and reducing the chance of a blowout. synthetic barium sulfate is used as a component of white pigment for paints, paper coatings, linoleum, textiles, rubber.
It is also used in various manufacturing applications and mixed into heavy concrete to serve as a radiation shield. This drug is used as a contrast agent in diagnostic x-ray procedures.
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Barium Sulfate is highly reflective, of both visible and ultraviolet light. Researchers used it as an ingredient in paint that reflects 98.1% of solar radiation, allowing surfaces to which it has been applied to stay cooler in sunlit conditions.
A thin layer of barium sulfate called baryta is first coated on the base surface of most photographic paper to increase the reflectiveness of the image, Barium Sulfate is commonly used as a filler for plastics to increase the density of the polymer in vibrational mass damping applications
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