noun
fire resistance
Technical term used in engineering, construction, and materials science to describe the ability to withstand fire or high temperatures.
この建材は高い耐火性を持っている。
This building material has high fire resistance.
耐火性を向上させるために、特殊なコーティングが施されている。
A special coating is applied to improve fire resistance.
耐熱性 means 'heat resistance' and is broader, covering resistance to high temperatures in general, not necessarily fire. 耐火性 is specifically about resistance to fire and flames.
Compound of 耐火 (fireproof, from 耐 'withstand' + 火 'fire') and 性 (property, characteristic).