耐火 たいか被覆 ひふく ざいじゃなかったです
taikahifukuzaijanakattadesu

Noun
Desu Copula

The polite, past negative form of 耐火被覆材

1. Wasn't fire-resistant coating.; Wasn't a fireproof covering.

Past/Perfective
Negative
Polite
Casual Register