GlassCatalogue_LowRes

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.
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