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by radicality 1332 days ago
The 425 seems to have higher steel adhesion and tensile strength. 3340 looks to be specifically geared towards HVAC.

Here’s a pdf to help select metal tapes:

https://multimedia.3m.com/mws/media/856073O/3m-metal-foil-ta...

And the data sheets for both tapes:

https://technicaldatasheets.3m.com/en_US?pif=000010?locale=e... https://technicaldatasheets.3m.com/en_US?pif=000116?locale=e...

And some more tape pdfs, honestly a lot of it is super interesting, I never put much thought just into how many different kinds of adhesives there are:

https://multimedia.3m.com/mws/media/1016166O/3m-masking-and-...

https://multimedia.3m.com/mws/media/1015901O/3m-industrial-a...

https://multimedia.3m.com/mws/media/1012104O/3m-converter-ma...