Wire gauze

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 inflammable 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]

Wire gauze may be woven from metals including iron,[5] steel,[6] copper,[7] and nichrome.[8] Nichrome alloy provides long life expectancy and tear resistance.[5][8] 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 4 inches (100 mm), 5 inches (130 mm), and 6 inches (150 mm) squares[3] to accommodate different sizes of glassware.