Glassary - C

Canopy:
an overhead device to keep rain off can also is used to provide shading on southerly facing glazing.

Canterbury™:
Pilkington Canterbury™ is the bran name for one of the Pilkington Oriel™ range of acid etched decorative glass. See consumer leaflet Pilkington Texture Glass™ for further details.

Cap:
an abbreviation for end cap.

Capping:
a term used in glazing, depending on context it can mean:

a glazing compound that has been applied to protect another material, for example a silicone sealant that is applied to protect an intumescent compound from the weather

a metal glazing bead in a patent glazing system.

Cast-in-place (CIP):
a type of interlayer used in the manufacture of laminated glass, by pouring a liquid resin between two panes of glass and curing it either chemically or by exposure to UV light.

Cathedral:
Competitor textured glass pattern, Pilkington Minster™ should be offered as a substitute.

Cavity:
the gap between the panes of an insulating glass unit also know as the airspace. See also Product Data Sheet on Pilkington Insulight™

Ceramic coating:
the enamel finish applied to toughened glass to manufacture Pilkington Spandrel Glass (this product was know as Pilkington Armourclad™) or spandrel panels. See Product Data Sheet Pilkington Spandrel Glass.

Chantilly™
Pilkington Chantilly™ is the brand name for one of the Pilkington Texture Glass™ range see consumer leaflet Pilkington Texture Glass™) of patterned glass. Pilkington Chantilly™ has an obscuration level of 2.

Class O:
see reaction to fire.

Class A:
see safety glass.

Class Ao:
see safety glass.

Class B:
see safety glass.

Class Bo:
see safety glass.

Class C:
see safety glass.

Class Co:
see safety glass.

Clear float:
untinted float glass (normal window glass) now called Pilkington Optifloat™ Clear.

Coated glass:
a base glass to which an inorganic coating has been applied, either a pyrolytic coating, usually applied on-line (i.e. during the manufacture of the float glass) or a sputtered coating applied off-line to stock sizes or cut sizes.

Cold radiation:
a description of the apparent effect felt when sitting near to a cold window surface, e.g. single glazing in cold weather.

Coloured film:
decorative applied film stuck on to the glass, usually in conjunction with applied leading to give the appearance of a leaded light. See also Product Data Sheet Pilkington Applied Colour Decorative Glass.

Comfort:
see thermal comfort.

Comprehensive surface stress:
see toughened glass.

Condensation:
the formation of water droplets on cold surfaces. Condensation is regularly seen on the room surfaces of single glazing, but its incidence is reduced by the use of insulating glass units and particularly those that contain Low E glass. (See also external condensation.)

Conduction:
one of the methods of heat transfer through glass or through the gas in the cavity of insulating glass units.

Conduction heat gain:
the transfer of heat from outside the building to the inside when the external air temperature is hotter than the internal air temperature.

Containment:
the ability of a glass or glazing product to prevent persons who accidentally fall against it from falling through. (See also guarding and barriers.) See also information in Technical Bulletins Glass and Safety and Safety and Glass and Building Regulations Stairs, Ramps and Barriers.

Convection:
one of the methods of heat transfer by the gas in the cavity of an insulating glass unit.

Cotswold™:
Pilkington Cotswold™ is the brand name for one of the Pilkington Texture Glass™ range (see consumer leaflet Pilkington Texture Glass™) of patterned glass. Pilkington Cotswold™ has an obscuration level of 5.

Critical locations:
those areas of a building, e.g. doors, adjacent to doors, or low level glazing, where glazing is most vulnerable to accidental human impact and which may require the use of safety glass. These areas are defined in BS6262 part 4:1992 Accident Human Impact. Further information is available in Technical Bulletin Glass and Safety.

Cross bar:
a support for the lead cames in large traditional leaded lights.

Cullet:
a term used for broken glass. Cullet is often mixed with the other raw materials (see glass) and recycled in glass manufacturing because it takes 50% less energy to melt cullet.

Curtain Slider:
a type of delivery vehicle that has sliding curtains along the sides to protect the load from the weather.

Curtain walling:
a glazing system in which the complete façade is glazed into frames attached to the building structure. The glazing may include both vision areas and spandrel panels.

Curved glass:
glass, which has been heated past its softening point and formed into a curved shape, usually by draping the softened glass over or into a mould. The shaped glass is subsequently cooled slowly to form annealed glass or it may be rapidly chilled to form toughened glass.

Cut sizes:
panes of glass cut to the final size for glazing.