Q: I’m looking for a polymer that can be exposed to low concentration of sulfuric acid. Which polymer do you recommend? I tried PTFE but they don’t seem to be as strong as I need.
A: PTFE and PFA fasteners offer the highest polymer corrosion resistance but the trade-off is lower strength. You may want to try PVDF fasteners. PVDF screws are slightly less corrosion resistant but hold up well in sulfuric acid and offer much higher strength than PTFE or PFA. PVDF is also usable to about 150°C (300°F)