noun, noun which may take the genitive case particle 'no'
non-flammability; incombustibility
Technical term used in materials science, building codes, and safety regulations. Often appears in compound nouns like 不燃性材料 (non-combustible material).
この建材は不燃性が高い。
This building material has high incombustibility.
不燃性のゴミは指定の袋で出してください。
Please put out non-burnable trash in the designated bags.
難燃性 means flame-retardant or fire-resistant, implying reduced flammability rather than complete non-flammability.
Compound of 不 (non-) + 燃 (burn) + 性 (-ity, property). A straightforward Sino-Japanese technical term.