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Not quite....

Posted by alan m. kafton on September 24, 2016 at 15:33:53:
There are different "mixes" of copper & brass, with lesser-grade connectors and outlets having a lesser-amount of copper content.

I know this as factual when I was researching Hubbell products 16-18 years ago. Their spec-grade, heavy-duty products had a much higher amount of copper (ranging from 70-72%, depending on the batch) versus their commercial-grade products, which had (if memory serves) approx. a 55-56% copper content.

However, if a company marketing connectors & outlets stating that their products contain "high-purity copper" cannot back up that statement, then indeed you are correct. In other words, "high-purity copper" compared to what? And what defines "high-purity copper"....what's the percentage vs. the brass alloy? In my view, if a product doesn't meet Hubbell's high standards of content, it ain't "high-purity".