Is there a plastic that's clear, acetone resistant, and ideally sold in sheet stock that's ~1/8" or 1/4" thick? Both acrylic and polycarbonate are out, they turn cloudy on contact with acetone. I tried a piece of PETG and it was better, but still turned fairly cloudy after a few seconds. I don't need continuous service, but I need it to still look decent if it gets wiped down with acetone.
According to Palstics International's Chemical Resistance Chart, the A-rated plastics (no solvent attack) towards acetone are:
- ECTFE (Halar®): transparent films available
- Fluorosint® PTFE: white
- HDPE: transparent films available
- Nylon®, Type 6/6: white
- PP: clear sheets available
- PPS: opaque white
- PTFE: white
Among these, polypropylene appears to be the only plastic that satisfies all criteria.
I think the only real option for this is a clear plastic sheet that's had a chemical resistant thin film applied to the faces. One commercially available example is Makrolon AR2, it's polycarbonate with some proprietary coating that's listed as having >24hrs resistance to acetone and a few other chemicals.
Alternatively, cast your own sheet (or straight your close-to-final piece) using a mold from a chemical resistant 2 part epoxy. Usually, difunctional or polyfunctional amine hardeners confer chemical/temperature resistance, causing a polymerization in a 3D cross-linked network (it also means saying goodbye to thermoplasticity).
Google search - customize it for the TLD/geo area you live in.
Example of a result that works for me (haven't use it yet, but I had a chat with a sale representative and confirmed that it maintains its clear/mechanical resistance when using with acetone after the cure).