Wire gauze
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Wire gauze or wire mesh is a gauze woven of metal wire, or very fine, gauze-like wire netting. Wire gauze is placed on the support ring that is attached to the retort stand between a burner and glassware, or is placed on a tripod to support beakers, flasks, or other glassware to protect it during heating.[1][2] Glassware should not be heated directly by the flame of a Bunsen or other gas burner; wire gauze diffuses the heat and protects the glassware. Glassware has to be flat-bottomed if rested on the wire gauze.[3]
Wire gauze was also used in safety lamps containing a flame in coal mines and environments where flammable gases may build up; the gauze prevents the flame from igniting gas outside the lamp, causing an explosion.
Some wire gauze is made with a ceramic centre.[4] Plain wire gauze can transmit heat efficiently, but gauze with a ceramic center disperses the heat more evenly.[4] The ceramic at the centre of the wire gauze is enmeshed at high pressure to prevent it from peeling.[5]
Traditionally the ceramic centre has contained asbestos. Although most suppliers in the EU now certify their ceramic-centred gauzes to be asbestos-free, imports from other countries may still contain it.[6]
Wire gauze may be woven from metals including iron,[5] steel,[7] copper,[8] and nichrome.[9] Nichrome alloy provides long life expectancy and tear resistance.[5][9] The edges of the wire gauze are turned inward to help prevent fraying,[5] improve handling, and eliminate sharp protruding wire ends.
Ceramic-centered wire gauze is typically made in Script error: No such module "convert"., Script error: No such module "convert"., and Script error: No such module "convert". squares[3] to accommodate different sizes of glassware.
Additional images
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6-inch (150 mm) and 5-inch (125 mm) wire gauze squares
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Beaker supported on wire gauze
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Beaker supported on wire gauze on tripod
See also
References
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