noun
fire resistive covering material; fireproof coating material
Technical term used in construction and fire safety for materials applied to structural elements to provide fire resistance.
鉄骨には耐火被覆材が施工されている。
The steel frame is covered with fire resistive covering material.
耐火被覆材の厚さを確認してください。
Please check the thickness of the fireproof coating material.
Compound of 耐火 (fire resistance) + 被覆 (covering) + 材 (material). A straightforward technical term with no unusual etymology.