noun which may take the genitive case particle 'no'
entirely domestically produced; 100% domestically made
Used for goods, food, or products made entirely within Japan, often with a nuance of quality or safety. Commonly appears as a modifier before nouns.
この車は純国産です。
This car is entirely domestically produced.
純国産の野菜を使っています。
We use 100% domestically grown vegetables.