Abstract: A subcutaneous implant for supplying one or more trace elements to an animal. The implant is made from a zinc oxide based glass which is prepared in rod form, a short section of the rod being implanted under the skin of an animal. Typically the glass may contain selenium dioxide for supplying small quantities of selenium to the animal.

Abstract: A corrosion inhibiting material comprises a water soluble zinc oxide/phosphorus pentoxide/alumina glass which, when in contact with water, releases ions which inhibit corrosion of adjacent metal surfaces. Advantageously the glass is finely ground and then dispersed in a resin carrier to form a paint. The glass composition is preferably 54.6 to 63.3 mol % zinc oxide, 35.8 to 45.3 mol % phosphorus pentoxide; the remainder at least 0.1 mol % aluminum oxide.

Abstract: A range of titano-borate glass compositions e.g. for use as cross linking agents in the preparation of polycarboxylic acid cements. The glass may contain one or more further metal oxides, for example calcium and/or zinc, and typically comprises 25-40 mole % calcium, 45-65 mole % boric oxide and up to 15 mole % titanium dioxide. The specification also describes the preparation of polycarboxylic acid, typically polyacrylic acid, cements incorporating the glasses.

Abstract: A potassium fluoro-borate glass, including silica and optionally alumina, containing at least 20 mole % potassium computed as K.sub.2 (O,F.sub.2), and wherein there are more fluorine atoms in the glass than oxygen atoms. The range of compositions includes low refractive index glasses, some with refractive indices less than that of silica, and high coefficient of thermal expansion glasses, some with coefficients matching those of aluminum, copper and brass.

Abstract: A subcutaneous implant for supplying one or more trace elements to an animal. The implant is made from a zinc oxide based glass which is prepared in rod form, a short section of the rod being implanted under the skin of an animal. Typically the glass may contain selenium dioxide for supplying small quantities of selenium to the animal.

Abstract: In a water soluble glass composition for effecting cross-linking of a polycarboxylic acid cement, typically polyacrylic acid, the glass is treated with phosphorus pentoxide or a phosphate containing material. This inhibits the initial setting stage of the cement and thus prolongs the period within which the cement can be worked. The glass may be of the zinc oxide/boric oxide/alumina type or of the fluoroaluminoborosilicate type.

Abstract: An anti-corrosion paint composition includes a glass material based on a silica type glass and containing zinc and phosphate ions which are leached into an aqueous solution.

Abstract: A nitrogen containing slow release glass fertilizer is prepared by co-melting phosphorus oxynitride with phosphorus pentoxide, an alkaline metal oxide and an oxide of a metal of Group II or Group III of the periodic table.

Abstract: A biologically active slow release medium consisting of vitreous matrix including one or more water soluble biologically active constituents together with phosphorus pentoxide which vitreous matrix may include one or more dispersed phases, the vitreous matrix having a slow rate of solution in water, such that when the medium is immersed in water biologically active constituents are slowly released into solution. Nitrogen releasing material is also incorporated into the vitreous (glass) matrix, using an inorganic material that can be added to a melt of the glass to be formed.