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Glossary Of Terms / C

Glossary Of Terms / C Molten glass Mould Glass is produced by pouring molten glass into a mould. Ceramic enamel (frit) A combination of crushed glass, metal oxide colourants and flux mixed in an oil or water medium and fused onto glass. Also known as ceramic ink. Cerium oxide A compound used alone or together with other substances as a polishing agent for glass. Chair rail A fixed glazing bar or rigid push bar that provides protection from human impact. Also known as a crash rail. Chamfer A transitional edge between two faces of an object. A form of bevel, it is created at a 45° angle to two adjoining right-angled faces. Channel A U-shaped opening in a sash or frame to receive glass or insulating glass unit. Channel depth The measurement from the bottom of the channel to the top. Channel width The distance between the fixed and removable beads at the widest point. Chemically toughened glass Chemical toughening of glass is brought about through a process known as ion-exchange. Glass is submersed in a molten salt bath at temperatures below the annealing range of the glass. In the case of soda lime silica glass, the salt bath consists of potassium-nitrate. During the submersion a chemical reaction takes place leaving the glass stronger. Chip A small shallow piece of glass which has become detached from the original glass edge or the void it has left. Chord A straight line (or measurement) joining ends of an arc. 226 Product Catalogue For Glass Processors & IG Manufacturers

Glossary Of Terms / C Cladding glass Used in curtain walls or as a cover to columns and walls.This glass is usually painted or has a ceramic ink applied to hide whatever it covers. The glass is usually toughened or heat strengthened. (See also Spandrel). Clips Wire spring devices to hold glass in place. Used in rebated sashes, or frame without stops, and face glazed. CNC processing (computer numeric control) The automation of machine tools by means of computers executing pre-programmed sequences of machine control commands. This type of machinery enables the very accurate processing of sophisticated shapes in glass. Coefficient of expansion The amount a given material increases or decreases in size with temperature changes. Cohesion The molecular attraction that holds the body of a sealant or adhesive together; the internal strength of an adhesive or sealant. Cohesive failure The breakdown of the bonding of an adhesive. If adhesive materials remain on both surfaces and separate, then the unit has a cohesive failure. Coincidence dip The frequency at which a glass panel vibrates in unison with the frequency of sound pressure waves hitting the glass. This significantly reduces the sound insulating properties of the glass at that specific frequency. Colonial bars Horizontal or vertical bars that divide a sash frame into smaller panels of glass. Colonial bars are smaller in dimensions and weight than mullions. They are sometimes surface fixed to glass or used inside an IGU. Similar to Muntin bars. See Georgian bars. Colourant A substance that is added to change the colour of something. Condensation The appearance of moisture on the surface of glass caused by warm moist air coming into contact with the colder surface of the glass. Conduction Heat transfer in which there is a direct contact of molecules in a solid body, eg. the passage of heat along a metal bar of which one end is inserted into a fire. Consistency Degree of softness or firmness of a compound as supplied in the container. This varies according to method of application. Email: | Web: 227