Eventually
Asbestos
The heat shield tiles used in the Space Shuttle are about the most heat-resistant things I know of; they are made of ceramic with lots of tiny air bubbles, like a foam.
Only conductive instruments conduct heat, depending on the material of the instrument. E. g. metal is a good conductor, thus wouldn't be heat resistant. If heat resistant means "still functioning despite the fact that it is hot" then many instruments made with metal parts are heat resistant. Metals have great dimensional stability up to their Curie temperature. Heat resistant instruments are made (usually intentionally) of materials that are not affected (much) by the heat they are expected to endure when in use.
A cotton material is best for an ironing board cover as it is heat-resistant and allows for smooth ironing.
asbestos
Bennox is a heat-resistant material, commonly used in industrial applications such as in the manufacturing of exhaust systems and heat shields due to its ability to withstand high temperatures. Its high temperature resistance makes it suitable for environments where extreme heat is a concern.
Titanium is highly heat resistant.
The best material for an ironing board cover is usually heat-resistant and durable cotton or silicone-coated fabric.
Aerobic and anaerobic bacterial spore formers have specialized structures called endospores that protect their genetic material from harsh conditions like heat. These endospores are highly resistant to heat, making the bacteria more heat-resistant overall. In contrast, the tubercle bacillus (Mycobacterium tuberculosis) lacks such protective structures, making it less heat-resistant than spore-forming bacteria.
Thermoplastic materials soften when exposed to heat, making them less resistant to high temperatures compared to thermoset materials. The specific heat resistance of thermoplastics varies depending on the type of polymer used. It is important to consider the heat resistance of a thermoplastic when selecting a material for a specific application.
The literal definition is clay and chemicals fired together to create a hard brittle heat resistant material
A heat-resistant material such as silicone or a blend of cotton and polyester would be suitable for an insulating material in a hot mitt. These materials can withstand high temperatures and provide protection against heat.