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RE: Ultraperm 80

24.27.41.140

Triode_Kingdom

In Reply to: RE: Ultraperm 80 posted by Best audiotransformers on June 13, 2025 at 03:54:14

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.

Follow Ups:

RE: Ultraperm 80 - dave slagle 15:22:16 06/13/25 (1)
I am not 100% sure this was ever a 3M product. I think the 3M branding is simply from the adhesive and is not indicative of the overall manufacturer. Put another way it could simply be a 3M adhesive attached to a Vacuumschmelze nickel by a third party.

There was a large amount of this specific material available from multiple surplus sources about 25 years ago at like $6 a sheet in packs of 100. People started buying them 100 at a time and flipping them on ebay for $20-30 a sheet about 20 years ago and as the surplus market dried up, the ebay price went up.... some kept the price the same and cut the sheets in half.... ahhh shrink-flation.

dave
- RE: Ultraperm 80 - Triode_Kingdom 16:37:04 06/14/25 (0)
  Didn't think it was quite 25 years ago, but I did buy four or five sheets at about $4 each. I think it came from Electronic Goldmine, which also sells PC drill bits and such (my main need at the time). Anyway, I'm sure I remember looking this up on the 3M site and finding specifications that appeared to describe it as a product of theirs. They do still sell EMI absorption materials, but not this one. It's a mystery :)

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