Insulated Copper Wire

FWIW every place we've sold cat-5 to hasn't tripped about the ends precisely because the post-insulation removal non-copper contamination is within the bounds acceptable as #1 for most buyers. But buying policies vary so don't take that as gospel.



Also the terms 'low grade' and such have firm meanings only to the yard and then mostly for inventory value tracking. Like where I work we buy 65% #2 wire as "#2 high grade" but 65% #1 as "#1 mid grade". Getting consistently terminology from your yard(s) about % copper recovery might help more than low-grade/high-grade terms unless they're firmly defined.