What type of material does NOT support combustion even under accelerated conditions?

Name: What type of material does NOT support combustion even under accelerated conditions?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

Fire proof materials are able to withstand flames and high temperatures without catching fire or supporting combustion. Fire break, fire resistant, and fire retardant materials are all designed to slow or stop the spread of fire, but they may still be able to catch fire under certain conditions.

What Type of Material Does NOT Support Combustion Even Under