Bumpety-bump.
About ripster's oddball Cherry key, well, my G80-3000HEMDE also obviously has its Windows and Menu keys made from a different material than the others, since only those are yellowed a bit on top (and only on top)! Looking underneath, they aren't doubleshots either. Ripster, what vintage was that POS board?
Here's
a good overview of service temperatures and other properties that I found. PS seems to be
similar to ABS.
This Wiki and
this website are quite interesting as well.
I don't think one would be able to tell apart PS and ABS in homebrew boiling and acetone tests. Should work for PVC though. POM, PC, PP and PBT would all be rather unimpressed. Unsure what a PC/ABS blend might do - sounds like a case (no pun intended) for the poor old Boscom.
Hmm, I wonder whether those old Cherry doubleshots might have been from PP - apparently it does yellow.