Gypsum plaster

Gypsum [7778-18-9] Gypsum board Gypsum plaster board Gypsy... 

Calcined Anhydrite. Soluble anhydrite, or second-settle stucco, has physical properties similar to those of gypsum plaster. It hydrates to the dihydrate rapidly in water. Its outstanding property is its extreme affinity for any moisture, which makes it a very efficient drying agent (see Desiccants). In ambient moisture-laden air, it readily hydrates to hemihydrate. Soluble anhydrite, under the trade name Drierite, is widely used as a desiccant in the laboratory and in iadustry. A small amount is also used as an insecticide carrier. Small amounts of soluble anhydrite are unintentionally produced in most commercial calciners during hemihydrate production. 

Gips-brei, m. paste of plaster (Paris), -bren-nen, n. gypsum burning, -brennerei, /. calcination of gypsum plaster kiln, -brenn-ofen, m. plaster kiln, gipaen, v.t. plaster. — a. gypseous. 

Construction Soil stabilization water absorber water retention aids in cements, grouts, and tiles improvement of mechanical properties of cement and gypsum plasters and water based paints... 

Gypsum plaster boards with micro-encapsulated paraffin... 

Coburn, A., E. Dudley, and R. Spence (1990), Gypsum Plaster Its Manufacture and Use, Intermediate Technology Publications, London. 

Wall paper covering on gypsum plaster board nd nd nd nd none )... 

Stopper the flask and shake it until all the powder is wet. This material MUST be used quickly because there is a gypsum (plaster) binder present. 

This is easier than pretreatment of the fuel, but the waste is calcium sulfite which, unlike the more familiar sulfate (gypsum, Plaster of Paris), is quite toxic to plants and is therefore difficult to dispose of safely. 

This manipulation requires that the mass to he formed be of sufficient tractability to be easily introduced into the cavities of the mould by kneading, and that, when pressed, It be of sufficient tenacity as not to bend or yield upon removal. It must, therefore, acquire consistency, and dry in the mould—a condition which Tenders it absolutely necessary that the moulds he constructed of substances of a porous nature, otherwise the pieces would adhere and lose their shape upon removal. The moulds are, therefore, generally formed of gypsum—plaster of Paris—and sometimes of burned clay, and are of every variety of size and pattern, a complete set of pattarns being required for evory new design, and for every size of the same pattern. Moulds for plates, dishes, and other shallow articles, consist of only one pioco, while for jugs, vases, and more elaborate forms, several pieces or moulds are employed. 

Gypsum (plaster of paris), quicklime, cements, are discussed by Pliny, but little of interest added to information given by Theophrastus and Vitruvius. 

CEMENT. Cement is a finely powdered substance that possesses strong adhesive powers when combined with waler. Gypsum plaster (see also Calcium), common lime, hydraulic limes. Puzzolan, natural and Portland cements are a few of the materials which are used for cementing purposes. 

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