Question

Non -combustiable substance
definition​

Answer 1

Answer:

A non-combustible is a substance that does not ignite, burn, support combustion, or release flammable vapors when subject to fire or heat, in the form in which it is used and under conditions anticipated

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Answer 2

Non combustible substances don’t have an ignition temperature. They do not burn physically. They do not produce flames or heat or light in any case.
Eg- glass