noncombustible

adjective
non·com·bus·ti·ble | \ˌnän-kəm-ˈbə-stə-bəl \

Definition of noncombustible 

: incapable of igniting and burning when subjected to fire : not combustible noncombustible materials drums of noncombustible waste

First Known Use of noncombustible

1827, in the meaning defined above

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The first known use of noncombustible was in 1827

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