Heatproof mat
A heatproof mat is a piece of apparatus commonly used in tabletop lab experiments that involve moderate temperatures to prevent damage to a work surface. They may also be used for domestic equipment, such as hot plates, hair stylers, hair straighteners or other hot objects.
Traditionally, such mats were made of asbestos. Fiberglass, calcium silicate or other substitutes are now used because of the toxicity of asbestos fibres.