fire resistance; fire resistant
Used to describe the ability of a material or structure to withstand fire or high temperatures. Common in technical and everyday contexts.
This building material has high fire resistance.
To increase fire resistance, we used fireproof materials.
耐火 is a broader term meaning 'fireproof' or 'fire-resistant', often used as a prefix in compounds like 耐火構造 (fireproof construction). 耐火力 specifically refers to the capacity or strength of that resistance.
Compound of 耐 (たい, 'resist') + 火 (か, 'fire') + 力 (りょく, 'power, strength'). The exact historical derivation is uncertain, but the word follows a common pattern for technical terms describing resistance capabilities.