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Organisationally, all domestic gypsum activities were consolidated in the British Gypsum subsidiary and the parent company was BPB Industries. BPB had also acquired the main paper supplier in 1953 – the Aberdeen firm of C. Davidson. [citation needed] The post-war period saw extensive overseas investment through subsidiaries and associates.
Various sized cuts of 1 ⁄ 2 in (13 mm) drywall with tools for maintenance and installation . Drywall (also called plasterboard, dry lining, [1] wallboard, sheet rock, gib board, gypsum board, buster board, turtles board, slap board, custard board, gypsum panel and gyprock) is a panel made of calcium sulfate dihydrate (), with or without additives, typically extruded between thick sheets of ...
A gypsum block is made of gypsum plaster and water. The manufacturing process [1] is automated at production plants where raw gypsum (CaSO 4 ·2H 2 O) is ground and dried, then heated to remove three-quarters of the bound water and thus transformed into calcium sulfate hemihydrate (CaSO 4 ·½H 2 O), also known as gypsum plaster, stucco, calcined gypsum or plaster of Paris.
Because gypsum dissolves over time in water, gypsum is rarely found in the form of sand. However, the unique conditions of the White Sands National Park in the US state of New Mexico have created a 710 km 2 (270 sq mi) expanse of white gypsum sand, enough to supply the US construction industry with drywall for 1,000 years. [18]
Many of the cement works and their associated chalk pits had narrow gauge railways, particularly those in the South East of England. The Associated Portland Cement Manufacturers Ltd. (APCM, later Blue Circle Industries, and Lafarge) was the major producer of cement in the United Kingdom in the second half of the twentieth century and many of their plants used railways.
For the sweets produced in Bradford, the confectioner was supposed to purchase powdered gypsum, but a mistake at the wholesale chemist meant arsenic was purchased instead. Three men were arrested—the chemist who sold the arsenic, his assistant and the sweet maker—but all three were acquitted after the judge decided it was all accidental ...
White Portland cement is used in combination with white aggregates to produce white concrete for prestige construction projects and decorative work. White concrete usually takes the form of pre-cast cladding panels, since it is not economical to use white cement for structural purposes.