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The Erith plant had the capacity to manufacture the gypsum plaster (the core of the plasterboard product) and BPB began importing gypsum rock from Canada. This encouraged negotiations with other gypsum companies in Britain and a "breath-taking series of take-overs" followed in the next two years, making BPB the dominant force in the industry.
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.
Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO 4 ·2H 2 O. [4] It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, drywall and blackboard or sidewalk chalk.
On heating to 180 °C (350 °F), the nearly water-free form, called γ-anhydrite (CaSO 4 ·nH 2 O where n = 0 to 0.05) is produced. γ-anhydrite reacts slowly with water to return to the dihydrate state, a property exploited in some commercial desiccants. On heating above 250 °C (480 °F), the completely anhydrous form called β-anhydrite or ...
A restored gesso panel representing St. Martin of Tours, from St. Michael and All Angels Church, Lyndhurst, Hampshire. Gesso (Italian pronunciation:; 'chalk', from the Latin: gypsum, from Greek: γύψος), also known as "glue gesso" or "Italian gesso", [1] is a white paint mixture used to coat rigid surfaces such as wooden painting panels or masonite as a permanent absorbent primer substrate ...
White Portland cement is also used in combination with inorganic pigments to produce brightly colored concretes and mortars. Ordinary cement, when used with pigments, produces colors that may be attractive, but are somewhat dull. With white cement, bright reds, yellows and greens can be readily produced.
Live Search Books was a search service for books launched in December 2006, part of Microsoft's Live Search range of services. Microsoft was working with a number of libraries, including the British Library , to digitize books and make them searchable, and in the case of out-of-copyright books, available across the web.