耐火

1. Origins, structure, and basic meaning

• Structure: 耐火 (たいか) is a modifying noun for resistance to fire, forming compounds with the item or property protected.
• Basic usage: 耐火性能 names the fire resistance of material used in warehouse doors, while 耐火金庫 names a fireproof safe holding important documents.

2. Common pitfalls and similar expressions

• Performance rating and product category
  • The head of 耐火性能 is 性能, while the head of 耐火金庫 is 金庫. 耐火 alone specifies neither material nor safe and does not make an absolute claim of impossibility of burning.