Research Results For 'Anhydrous'

ANDRICITE

Andricite is a trade name for anhydrous calcium sulphate.
Research Andricite

ANHYDROUS

In chemistry, anhydrous refers to something which is without water.
Research Anhydrous

HYDROFLUORIC ACID

Hydrofluoric acid, fluohydric acid or hydrogen flouride is a strong acid obtained by the action of concentrated sulphuric acid on fluorspar in a leaden vessel, which, though monobasic, forms double salts of the alkali metals by union of a molecule of salt and of acid. Hydrofluoric acid is a solvent of silica and silicates. Hydrofluoric acid is obtained in aqueous solution by heating calcium fluoride with concentrated sulphuric acid and condensing the gas given off in water.

The anhydrous acid is a colourless liquid, with a boiling-point just above the ordinary temperature. It is usually used in aqueous solution, and is kept in caoutchouc bottles. It blisters the skin and is used for etching glass. When the vapour is used the etching is transparent, but with the solution it is dull. The glass to be etched is coated with a thin layer of wax, and the design traced with a fine pointed instrument, and after etching the wax is dissolved away and the design becomes visible. Hydrofluoric acid is also used to decompose and dissolve silicates in mineral analysis.
Research Hydrofluoric Acid

PROPYLENE OXIDE

Propylene oxide is a colourless liquid with an ether-like odour that is used mainly as a chemical intermediate in the production of polyurethane polyols, which are used to make polyurethane foams, coatings, and adhesives. It is used in the manufacture of propylene glycol, which is used in fibreglass-reinforced plastics, foods, cosmetics, pharmaceuticals, cigarette tobacco, packaging materials, dyes, and hydraulic fluids. It is also used in the preparation of glycol ethers, dipropylene glycol, industrial polyglycols, lubricants, surfactants, oil demulsifiers, isopropanolamines, and as a solvent and soil sterilant. It is used in fumigation chambers for the sterilization of packaged foods; as a stabilizer for methylene chloride, fuel, and heating oils; in treating wood for termite resistance; as an acid scavenger and pH control agent; for removing residual catalysts from crude polyolefins; in fuel-air explosives in munitions; and as a component of Zeospan, a polyether rubber. Propylene oxide is a volatile, flammable liquid
that is soluble in water, alcohol, and ether. It is highly dangerous when exposed to heat or flame. It has a violent reaction with hydrogen chloride, chlorosulphonic acid, hydrogen fluoride, and oleum. It should not be stored in the presence of acids, bases, chlorides of iron, aluminum, and tin, or peroxides of iron and aluminum; any of these may cause violent polymerization.
Propylene oxide is miscible with most organic solvents, and forms a two-layer system with water. It is incompatible with anhydrous metal chlorides, iron, strong acids, caustics, and peroxides, and reacts vigorously with oxidizing materials. When exposed to flame, propylene oxide can explode. Polymerization may occur due to high temperatures or contamination with alkalis, aqueous acids, amines, and acidic alcohols.
Propylene oxide is also known as epoxypropane; 1,2-epoxypropane; methyl ethylene oxide; methyl oxirane; propene oxide; and 1,2-propylene oxide. Derivatives of
propylene oxide are polyether polyols; propylene glycol; di- and tripropylene glycol; poly (propylene glycol)s; surfactants; glycol ethers; and isopropanolamines.
Research Propylene oxide

SODIUM CARBONATE

Sodium carbonate (soda or soda ash) is an anhydrous, greyish-white, odourless, water-soluble powder. It is used in the manufacture of glass, ceramics, soap, paper, petroleum products. It occurs naturally in alkaline lakes but is derived mainly from sea water by way of electrolysis.
Research Sodium Carbonate

SODIUM IODIDE

Sodium iodide is a salt found in kemp. It forms anhydrous cube crystals which are very soluble in water and alcohol.
Research Sodium Iodide

ZINC CHLORIDE

Zinc chloride (formerly known as butter of zinc) is a white crystalline compound with the formula ZnCl2. The anhydrous salt, which is deliquescent, can be made by the action of hydrogen chloride gas on hot zinc. It has a relatively low melting point and sublimes easily, indicating that it is a molecular compound rather than ionic. Various hydrates also exist. Zinc chloride is used as a catalyst, dehydrating agent, a wood preservative for discouraging fungoid growths and as a flux for hard solder.
Research Zinc Chloride

THENARDITE

Thenardite, named after the French chemist, Louis-Jacques Thenard, is a white or brown coloured mineral with a vitreous lustre that dissolves easily in water and has a weak salty taste. It forms in sedimentary evaporate deposits in lakes and the playas of desert climates. Thenardite was confirmed as a distinct species of mineral in 1826 and is used in the glass and paper-making industries. Anhydrous sodium sulphate It has the formulae Na2SO4 and a relative hardness of 3.
Research Thenardite

FOLLOWING THE TROWEL

Following the trowel is a painting technique employed on acid anhydrous gypsum plasters in order to improve the adhesion of the paint. Following the trowel consists of applying a sharp coat of paint to the newly plastered surface as soon as it is firm enough to bear the weight of the brush, ideally within three hours of the plastering being completed.
Research Following The Trowel

KEENE'S CEMENT

Keene's cement is an anhydrous gypsum plaster of the hard-burnt type - that is composed of calcium sulphate to which an accelerator has been added. Keene's cement is used in decorating where a hard, compact, smooth plaster is required, often for external angles and mouldings.
Research Keene's Cement

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