technical-grade vs technical grade

technical-grade and technical grade both are adjectives.

Word	Noun	Adjective	Verb	Adverb
technical-grade	No	Yes	No	No
technical grade	No	Yes	No	No

As adjectives, technical-grade and technical grade are synonyms defined as:

technical-grade and technical grade: containing small amounts of other chemicals, hence slightly impure

technical-grade (adjective)	technical grade (adjective)
containing small amounts of other chemicals, hence slightly impure	containing small amounts of other chemicals, hence slightly impure