Glossary for Glass and Glazing terms

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A

abrasion

A wearing, grinding or rubbing away by friction.


abrasion resistance

The inherent ability of a coating or substrate to resist degradation or destruction by friction.


acid etching

The process of decorating glass, which involves the application of hydrofluoric acid to the glass surface.


acid polishing

A process used in the production of cut crystal to remove the opacity of etched surfaces where decoration has been applied. Items to be polished are immersed in a mixture of demineralized water, sulphuric acid and hydrofluoric acid, and then rinsed. There may be a single short immersion in a stronger solution, or a series of immersions in a weaker solution.


aciding


acuity

Sharpness


adhesion, intercoat

The ability of coatings to adhere one to another.


adhesion, intracoat

The ability of a coating film to maintain its internal integrity without separating or layering.


adhesion, mechanical

Attachment of a coating film to a surface by molecular attraction without altering the coated surface.


air line

An elongated bubble in glass.


anneal

To control the residual stresses in glass by controlled heating at, and cooling from, a suitable temperature.


annealed glass

Technical definition of the stress condition of ordinary glass.


annealing

Process designed to eliminate or limit stresses to glass by submitting the glass to strictly controlled cooling in a special oven known as a ‘lehr’.


annealing point

Temperature at which the viscosity of the glass is approximately 1013 poises. At the annealing point of glass, internal stresses are substantially relieved in a matter of minutes.


anti-bandit glazing

A type of security glazing designed to resist manual attack and to delay access to the protected space for a short period of time.


anti-walk blocks

See edge blocks


antique glass

Glass with an uneven surface texture and bubbles inside, produced by using antique methods in order to obtain the appearance of glass made before the development of industrial processes.


application life

Period of time during which a sealant can be effectively applied to a joint. The timing is from completion of mixing and could be affected by temperature, humidity or a combination of both.


arrised edge

The result of removing sharp edges.


artwork

A design developed primarily for reproduction.


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.


autoclave

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.


B

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.


baluster

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


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).


batter

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.


bead

A strip of wood, metal, sealant or other suitable material secured to the rebate to retain the glass. Also known as glazing bead or sealant bead.


bed or bedding

The glazing material used to seal between the glass and frame/bead.


bedding or stop

In glazing, the application of compound at the base of the channel, just before the stop is placed in position, or buttered (see buttering) on the inside face of the stop.


bending

The process of manufacturing bent glass.



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