In New Zealand it is also called Gibraltar and Gib board, after the registered trademark ('GIB') of the locally made product that dominates the market there. In Australia, the product is often called Gyprock, which is the name of the largest manufacturer of plasterboard. The term plasterboard is used in Australia and New Zealand. Specifications Australia and New Zealand In 2020, 8.4 billion square meters of drywall were sold around the world. This is commonly used in drywall construction in the United States and elsewhere. The sulfur is absorbed by powdered limestone in a process called flue-gas desulfurization (FGD), which produces a number of new substances. Coal-fired power stations include devices called scrubbers to remove sulfur from their exhaust emissions. Organic dispersants and plasticisers are used so that the slurry will flow during manufacture, and to reduce the water and hence the drying time. When the core sets it is then dried in a large drying chamber, and the sandwich becomes rigid and strong enough for use as a building material.Дrying chambers typically use natural gas today. The board is then formed by sandwiching a core of the wet mixture between two sheets of heavy paper or fibreglass mats. The plaster is mixed with fibre (typically paper and/or glass fiber), plasticizer, foaming agent, finely ground gypsum crystal as an accelerator, EDTA, starch or other chelate as a retarder, various additives that may decrease mildew and increase fire resistance, and wax emulsion or silanes for lower water absorption. The raw gypsum, CaSO 4в™ІH 2O, is heated to drive off the water then slightly rehydrated to produce the hemihydrate of calcium sulfate ( CaSOДўO).

Manufacture ДЄ wallboard panel consists of a layer of gypsum plaster sandwiched between two layers of paper. In 2002 the European Commission imposed fines totaling в‚¬420 million on the companies Lafarge, BPB, Knauf and Gyproc Benelux, which had operated a cartel on the market which affected 80% of consumers in France, the UK, Germany and the Benelux countries. Vertically hung drywall with joint compound In 1936 US Gypsum trademarked ROCKLATH for their gypsum lath product.

As it evolved, it was faced with paper impregnated with gypsum crystals that bonded with the applied facing layer of plaster. An alternative to traditional wood or metal lath, it was a panel made up of compressed gypsum plaster board that was sometimes grooved or punched with holes to allow wet plaster to key into its surface. Gypsum lath was an early substrate for plaster. Later air entrainment technology made boards lighter and less brittle, and joint treatment materials and systems also evolved. Providing efficiency of installation, it was developed additionally as a measure of fire resistance. In 1910 United States Gypsum Corporation bought Sackett Plaster Board Company and by 1917 introduced Sheetrock. Gypsum board evolved between 19 beginning with wrapped board edges and elimination of the two inner layers of felt paper in favor of paper-based facings. Sheets were 36 by 36 by 1вЃ„ 4 inch (914В mm Г—В 914В mm Г—В 6В mm) thick with open (untaped) edges. It was made by layering plaster within four plies of wool felt paper.

Sackett Board was invented in 1894 by Augustine Sackett and Fred Kane, graduates of Rensselaer Polytechnic Institute. The first plasterboard plant in the UK was opened in 1888 in Rochester, Kent.

10.1 Types available in Canada and the United States.

8 High-sulfur drywall illness and corrosion issues.

Plaster wall