Depending on the grade of UHMW, it can be approx. 15% the weight of steel. Here is a link to it's physical properties - from Redwood Plastics http://www.redwoodplastics.com/wp-content/uploads/2010/08/UHMW-PE-NATURAL-VIRGIN-PROPERTIES.pdf
UHMW is available from Redwood Plastics.. here is the link to the product page: http://www.redwoodplastics.com/products/uhmw-polyethylene/virgin-uhmw-polyethylene/
UHMW stands for Ultra High Molecular Weight. Now it depends what the monomer is. UHMWPE would be thermoplastic not thermoset. But other UHMW polymers can be thermoset. It depends.
If a grit substance such as sand adheres to grease on a UHMW then it will be scratched and worn. Better to let it stay dry unless you are dealing with a limited event like using UHMW pads to launch a large vessel. We use a lot of UHMW in our program and always leave it dry.
UHMW floats because it has a lower density than water. Check the density of Delrin.
PTFE or UHMW
Yes.
Polyethelene terephthalate - Glycol
I find Loctite's super glue Activator works well: holds a patch of polyethelene sheet strongly on a sheet that had a hole (in a rink liner). The bond is strong enough to tear the underlying sheet when pulled hard, rather than peel off as other adhesives do on polyethelene (such as epoxy or super glue or silicon). Hot glue also works--but it's problematic on a thin sheet: too much heat and you make a new hole.
Some plastic used are PET (polyethelene teraphthalate), HDPE (high-definition polyethelene), LDPE (low-definition polythelene), PP (propolene), and sometimes the controversial BPA (bisphenal- A).
tupperware plastic is HDPE( high density polyethelene)
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There are many subtle variations of polyethylene, however acetone will not eat most of them.