I was rummaging in the tape box and came across a box of rolls I had never opened. I tried to use it to splice some lines, but it just didn't feel right.
First I tried lighting some 3M tape I had. It burned while exposed to the flame, but went out instantly.
Then I tried the no-name tape. Three inches vanished waiting for the 5 second timer!
Looks UL Listed to me. The HK74 registration is for a Chinese company, but I would bet it was ripped off by a different, less legitimate Chinese company.
The moral? For electrical components I try to stay with known brands. If the tape feels funny, put a match to it.