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RE: Ultraperm 80

Thanks for clarifying. 3M doesn't appear to still offer the same product under any name, so perhaps it was just a marketing decision. I have several sheets of this that I bought at a good price about 15 years ago. It was much less expensive than the prices I see now online. I don't know why that is, or even who is making it (maybe it's all old stock). In any event, this material does work to attenuate line noise from transformers, but the effectiveness is limited. It's mostly useful as a "last mile" sort of thing when just a little more cleanup is needed.

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