Aluminum Foil Duct Tape Heavy Duty Waterproof, Premium Silver Metal HVAC Heat Tapes (2"*65Feet,3.9mil), High Temperature, Dryer Vent Insulation Tape for Ductwork, Ducting, Sealing, Patching, Furnace

This tape was just what I needed to seal my air ducts. Works wonders . Easy to use and stayed were i put it. Very good quality. Id buy it again!

Very sturdy and does the job

Strong tape and adhesive.

Works well as intended and seems to be good quality.

Great tape for heat wrapping things , easy to use and very functional.

Good to seal the air ducts. Use to wrap around the insulation.

This tape sticks very well.

I was looking for an aluminum tape that was non-conductive (ie, the adhesion side wouldn't conduct electricity), as I use such tape to protect electric circuit boards from RF interference. Several 1-star ratings stated it's non-conductive (and they didn't like that, apparently wanting conductive tape for some reason). However they must have measured incorrectly, because I definitely registered conduction through my multi-meter. The description doesn't state that this is conductive. So for my needs this was useless, as I cannot have tape conducting electricity across the surface of an electronic board. Your needs may of course be different.In addition the adhesive does not hold if subjected to liquids. Get it wet or encase it in liquid resin, and it comes loose. Several of the negative reviews report poor adhesive qualities; I should have listened but there were so many positive reviews. (I have to wonder if the numerous positive reviews understand what aluminum tape is supposed to do or how it's supposed to work.) Aluminum tape should be very thin and conform to the shape of the surface. It should be very adhesive. The adhesive is ordinarily not supposed to be conductive unless specifically stated. Why would one want electricity coming through the tape itself? In addition this appears to be plastic-coated tape (which prevents oxidation), which is fine for me but some may not like that property. The plastic does make it less-malleable.So poor adhesion and is conductive. Can't be used to protect circuit boards. Money wasted as it's not worth the effort to return it.