The materials used are non-combustible and water-proof, and will wear indefinitely.
Asbestos is merely a non-combustible material in which air may be entrapped, but, when non-porous, is a good conductor of heat.
The whole of the building to be composed of non-combustible materials, such as iron, stone, or bricks.
They are composed almost totally of non-combustible materials.
Must be made entirely of non-combustible materials, except such minor parts as handles, magnet insulation, etc.
For five miles they had laid a blanket of non-combustible gases.
This will not apply to concealed work in walls or ceilings composed of concrete, tile or other non-combustible material.