I'm not trying to get into the middle of this. But we use UHMW all the time all over the place at the plywood mill, and as far as I've known it's just UHMW, like PVC is PVC, that's the name it goes by, that's what it's called.
To be fair, the original poster was probably safe to assume if any potential reader of his question didn't know what UHMW stood for, than they wouldn't be able to help answer anyway?
That's just my 2 cents on the issue, not trying to step on any toes. Take care, stay safe.
Edmonton, AB, Canada