Translation guide
The property of being unable to catch fire or burn. In Japanese, this is typically expressed using the noun 不燃性 (funensei) or the adjective 不燃性の (funensei no).
不燃性
incombustibility
Describing a material or substance that does not burn.
The standard noun meaning 'incombustibility' or 'nonflammability'. Used in technical, official, and everyday contexts.
この建材は不燃性が高い。
This building material has high incombustibility.
不燃性の素材を使用してください。
Please use incombustible materials.
Means 'flame retardancy' or 'difficulty in burning'. Slightly different from complete incombustibility; implies resistance to burning rather than absolute non-flammability.
このカーテンは難燃性です。
These curtains are flame-retardant.
A more colloquial way to say 'the property of not burning'. Literally 'non-burning property'.
この布は燃えない性質を持っている。
This cloth has the property of not burning.
Referring to official fire safety standards, especially in building codes.
Term used in Japanese building standards law for 'noncombustible material'. Often seen in specifications and regulations.
この壁は不燃材料で作られている。
This wall is made of noncombustible material.
Refers to 'noncombustible certification' or approval by authorities.
その製品は不燃認定を取得している。
The product has obtained noncombustible certification.
不燃性 (funensei) means completely noncombustible, while 難燃性 (nan'nensei) means flame-retardant or hard to burn. In everyday use, 不燃性 is the direct equivalent of 'incombustibility', but in technical contexts, the distinction is important.