You describe many plastics.
What do you want to scrape, and under what conditions.
PET might do the job. Have you tried cutting up an old Coke bottle, or buying a small sheet of "Mylar" film. Mylar is DuPonts trademark for their PET films, but here will be others. I just don't know their names of the top of my head.
Nylon, Polycarbonate, Acetal, Polypropylene or even Styrene might do, depending on details of use and expected life
Regards
pat pprimmer@acay.com.au
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.