When one of my copper buyers was describing why windings were now being downgraded below normal copper #2 he said it was because the enamel's glass transition (as opposed to melting) point created extra labor at furnaces. I have zero furnace experience myself so don't know what that means from a user perspective but glass transition contaminants without melting points are treated different than other contaminants that can be removed as slag. Dunno if that is useful at all. If not, enjoy the useless info!
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