na-adjective, noun which may take the genitive case particle 'no'
ultrahigh purity
Technical term used in chemistry, materials science, and semiconductor manufacturing to describe substances with extremely low impurity levels.
この実験には超高純度の試薬が必要です。
This experiment requires reagents of ultrahigh purity.
超高純度なシリコンは半導体の製造に使われる。
Ultrahigh-purity silicon is used in semiconductor manufacturing.
高純度 means 'high purity', a more general term. 超高純度 emphasizes an extreme level of purity, often used in specialized contexts.
Compound of 超 (chō, 'ultra-') + 高 (kō, 'high') + 純度 (jundo, 'purity'). A straightforward modern technical coinage.