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Oily feeling, water repellent plastic? Answered

What sort of plastic is it which has a permanently oily feel and water will bead on its surface?  We have some in the form of a butter melter which sits on top of a popcorn maker (hence temperature stable) and an ice-cream scoop. 
Also, polymorph plastic will adhere inseparably to it, as I found our when I tried to use the ice-cream scoop as a mould - whoops!
No real reason for asking - just one of those things I know that I don't know. (Thank you Donald.)

Discussions

Googling around a bit, UHMW sounds like the closest match, but looking at some of the products made from it I think I've got a UHMW faced hammer, and it's not the stuff. Slippy, but not the same greasy feel.
I think it's one of the polyalkenes (aka polyolefin) which is described as having a waxy or oily feel. 

Hard to tell without seeing the stuff, but my initial guess would have been HDPE -- High Density Polyethelyne -- or UHMW polyethelyne. The low-friction characteristics of this plastic can give it a greasy feel.

That would be my guess.  Some plastic ice cream containers are made of HDPE, and it has that same oily feel.

Fluorocarbons like Teflon, have a high water-repellance, the water beading in particular is a characteristic of fluorocarbons.

L

Nylon, like Kiteman says, or, if it wasn't for the comments about butter melting and heat,  UHMW Polyethylene.

If the polymorph hadn't stuck, I would have said Teflon.

Could be nylon?