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Beadmaker. Paris, France.
Courtesy the Rakow Research Library, Corning Museum of Glass


Brief Glossary

Borosilicate glass
Glass made from silica (70-80%) and boric oxide (7-13%) with trace amounts of the alkalis (sodium and potassium oxides) and aluminum oxide. This type of glass is resistant to thermal shock (it doesn’t break when changing temperature quickly) and has a low expansion rate. It has been used for technical glass such as lighting, laboratory apparatus, cookware (Pyrex) as well as for artistic applications.
-- adapted from the British Glass Manufacturers' Confederation; "About Glass"

Lampwork (a.k.a. Flamework, Glassblowing)
“The technique of forming objects from rods and tubes of glass that, when heated in a flame, become soft and can be manipulated into the desired shape. Formerly, the source of the flame was an oil or paraffin lamp used in conjunction with foot-powered bellows; today, gas-fueled torches are used.”
-- from The Corning Museum of Glass online "Glass Glossary"

Annealing (of glass)
Gradually cooling a finished piece of glass at a controlled rate, in an annealing oven or lehr, to reduce internal strain. Without annealing, as a piece of glass cools to room temperature, it contracts and, due to low thermal conductivity, does not cool uniformly. The surfaces cool more rapidly and shrink more than the center, producing excessive strain in the glass, and increasing the risk of breakage.

For more information, see:
www.britglass.org.uk/AboutGlass/GlassForming (Secondary Processing)


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