Quote:
Originally Posted by Antonmb
I don’t think anyone said that, only that any claim to purity beyond 99.99 purity is suspect.
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My father was a metallurgist....specialty steel industry including high-tech (non-copper) wire, think extreme aerospace and medical applications. Purity beyond 99.99% has been able to be quantified/measured for quite a long time now. I know you are saying such claims are suspect (which can be very true!) and not that such purity is impossible however if a firm is responsible they can publish accurate specs that substantiate the claim.