noncombustible

[ non-kuh m-buhs-tuh-buh l ]

/ ˌnɒn kəmˈbʌs tə bəl /

not flammable.

a noncombustible substance.

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First recorded in 1965–70; non- + combustible

non·com·bus·ti·bil·i·ty, noun

The materials used are non-combustible and water-proof, and will wear indefinitely.
Life in a Thousand Worlds|William Shuler Harris
For five miles they had laid a blanket of non-combustible gases.
The Hammer of Thor|Charles Willard Diffin
This will not apply to concealed work in walls or ceilings composed of concrete, tile or other non-combustible material.
Motion Picture Operation, Stage Electrics and Illusions|Henry C. Horstmann
Asbestos is merely a non-combustible material in which air may be entrapped, but, when non-porous, is a good conductor of heat.
Appletons' Popular Science Monthly, February 1900|Various

Must be made entirely of non-combustible materials, except such minor parts as handles, magnet insulation, etc.
Motion Picture Operation, Stage Electrics and Illusions|Henry C. Horstmann