絶縁 ぜつえん材料 ざいりょうじゃなかったです
zetsuenzairyōjanakattadesu

Noun
Desu Copula

The polite, past negative form of 絶縁材料

1. Wasn't an insulating material.; Wasn't insulation.

Past/Perfective
Negative
Polite
Casual Register