Are polyurethane and urethane caulks the same thing?

A dumb question here. I couldn’t find a good answer anywhere.

Are polyurethane and urethane caulks the same thing?

I was shopping for a caulk for a rubber/PVC connection. Only JTS1, a urethane caulk, claims good adhesion to both materials. All polyurethane caulks I checked out don’t mention to be used on rubber or PVC. It makes me think polyurethane and urethane caulks are quite different.

Many thanks!

Are you doing a PVC / EPDM tie-in? I use the PL polyurethane on EPDM repairs. The black will last for years, the limestone color seems to have UV problems. Vulkem is about the best I’ve seen…

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