Handling strong mineral acids requires materials that can withstand highly corrosive environments. This chart compares the top acid-resistant plastics, fluoropolymers, and elastomers at 20 °C and 50 °C.
A = Excellent B = Good C = Limited D = Not Recommended
PTFE and FEP are rated A (excellent) for hydrochloric acid at all concentrations and temperatures. PVDF is rated A at room temperature. HDPE and PP handle dilute HCl well but degrade at higher concentrations or temperatures.
Can Viton seals be used with sulfuric acid?
Yes, Viton (FPM/FKM) is rated A for dilute and concentrated sulfuric acid at room temperature. It is widely used for O-rings and seals in acid service. However, it should not be used with fuming sulfuric acid (oleum).
