noun, noun which may take the genitive case particle 'no'
flame retardance; flame resistance; incombustibility
Technical term used in materials science and safety standards. Often appears in compound nouns like 難燃性素材 (flame-retardant material).
このカーテンは難燃性の生地でできている。
These curtains are made of flame-retardant fabric.
建築基準法で、カーペット
Building standards require carpets to have flame resistance.
耐火性 refers to fire resistance, often for structural materials that withstand high temperatures, whereas 難燃性 focuses on slowing ignition and flame spread.
Compound of 難 (difficult) + 燃 (burn) + 性 (property), literally 'difficult-to-burn property'. A modern technical coinage.