Heat-resistant is a term used to describe materials or substances that are able to withstand high temperatures without being damaged or changed in their properties. Some synonyms for heat-resistant include fireproof, flame-resistant, heatproof, refractory, thermally stable, and non-conductive. Fireproof and flame-resistant are often used to describe materials that are highly resistant to catching fire or burning. Heatproof is used to describe materials that do not melt or become deformed when exposed to high temperatures. Refractory is used to describe materials that are capable of withstanding extreme temperatures and thermal shock. Thermally stable refers to materials that are able to maintain their physical and chemical properties when exposed to high temperatures. Non-conductive is used to describe materials that do not conduct or transfer heat.