How can I check whether a buyer's estimate of the copper content in my motor is actually fair?
Short answer: The most reliable way is to pull the windings out yourself and weigh the copper directly, which removes any guesswork entirely — if that's not practical, ask the buyer how they estimate copper content for that motor type and compare their percentage against a couple of other buyers' estimates for a similar unit, since a wildly inconsistent estimate between buyers is a signal worth questioning.
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List Free →The most direct way: pull it and weigh it
If you have the time and basic tools, physically removing the windings and weighing the copper yourself gives you a hard number instead of relying on anyone’s estimate — this is the only way to know the exact copper content with certainty.
When pulling isn’t practical
For situations where you’re selling intact motors at volume and pulling every unit isn’t realistic, ask the buyer to explain how they arrive at their copper-content percentage for that class of motor — a buyer with real experience should be able to give you a reasoned answer, not just a number.
Cross-checking against other buyers
Getting a second or third buyer’s rough estimate for the same type of motor, even informally, gives you a sense of whether one quote is meaningfully out of line — consistent estimates across buyers suggest a fair, experience-based number; a big outlier is worth a closer look.
How ScrapTrade Makes This Easier
Comparing offers from multiple verified buyers on ScrapTrade for the same motor listing is a practical way to sense-check copper content estimates without doing a teardown yourself.
Ready to sell or source electric motor scrap without the guesswork? ScrapTrade connects verified buyers and sellers with escrow-protected payments and transparent weighing.
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