Up until now, I thought dryer tape and foil tape were the same thing. So when I bought the first roll I didn't think too much of it.
The first roll I bought was looked like silvery metallic coloured tape which I assumed was real metal, but while working with it I noticed it was a very slightly translucent if you looked carefully. And that's when I started noticing that it actually felt, handled, folded, crinkled, and cut just like clear packing tape. Except it had a metallic silver colour. It comes on a roll just like normal tape. Maybe it has an adhesive better suited for duct work, I'm not sure. It was labelled as dryer tape. I ended up finding the datasheet and it indeed appears to be plastic tape.
Then later I encountered some tape that was clearly made of foil. It looks, feels, and tears like aluminum foil with an adhesive backing that you have to peel off.
Is there a functional difference between the two? Or maybe even a different purpose?