Glossary for Glass and Glazing terms

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aspect ratio

The ratio of the longer side of a panel to its shorter side.

asymmetrical material

Material is asymmetric when it is composite and some of the components are of different thicknesses.


A vessel that allows materials to be subjected to a cycle of controlled temperature and/or pressure. Such a vessel may be used to bond glass and other laminates.


back clearance

Space between the surface of the glass and the back of the rebate.

back compound

See glazing compound

back putty

That portion of the compound remaining between the back of the rebate and glass after the glass has been pressed into position in the bedding putty.

backer rod

A material placed into a joint, primarily to control the depth of the sealant and to prevent adhesion at the base of the sealant bead.


A vertical member supporting a handrail and forming part of a balustrade.


A series of balusters supporting a handrail or coping at the open side of a stair, ramp, elevated platform, landing, balcony, parapet, or bridge.
Also used as the collective name for the entire framed enclosure between handrail and floor level (see also handrail).


A surface defect that looks like hammered metal. Unless very heavy, it usually cannot be seen by the naked eye, although it can be clearly seen on the shadowgraph.

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