Sinonim technical grade

English Thesaurus

1. containing small amounts of other chemicals, hence slightly impure (adj.all)

similar	:	impure,
definition	:	combined with extraneous elements (adj.all)

domain category	:	chemical science, chemistry,
definition	:	the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions (noun.cognition)