noun, na-adjective, noun which may take the genitive case particle 'no'
high purity
Used as a noun or adjectivally (な/の) to describe substances, materials, or abstract qualities that are highly pure.
This laboratory produces high-purity silicon.
High-purity water is essential for experiments.
Compound of 高 (こう, 'high') and 純度 (じゅんど, 'purity').