This blog post highlights some notable examples of ozone resistant materials. Ozone resistant materials should resist both ozone’s penetration and its oxidizing activity.

Ozone Gas

  • Silicon
  • CPVC
  • Viton
  • Glass
  • Teflon (PTFE, FEP, PFA)
  • Stainless steel (300 series)

Ozone in Solution (Water)

  • Teflon (PTFE, FEP, PFA)
  • Glass
  • Stainless steel (316 series)
  • PVC

Gaskets, Fittings & Sealing Ozone Resistant Material

  • Kynar®
  • Teflon (PTFE, FEP, PFA)
  • Stainless steel (316 series)
  • Kalrez®

Note: Not all materials mentioned above may can resist high concentrations of ozone (20%).

The oxidizing power of ozone will oxidize all materials faster than the natural oxidation of oxygen. Since ozone is an oxidizer, it will oxidize materials as oxygen will naturally do. The only difference is that ozone is a more powerful oxidizer.

The way a material holds up to normal oxidation outdoors in fresh air is a good indication of whether it can be used with ozone. The same applies if the material is used with water or if it is used with chlorine.  If your ozone level is high, materials will oxidize faster. Many industrial ozone systems create ozone gas at concentrations greater than 5%. A system that produces less ozone can use lower quality materials.  

You should consider whether this component will be exposed to dry ozone gas, dissolved ozone in water, or ozone off-gas (wet ozone gas), as lower quality parts will react differently under each of these conditions.

Important Considerations About Ozone Resistant Materials

  • The concentrations of ozone will affect the material compatibility
  • In many cases, the perfect method to determine compatibility is by performing your own testing
  • As ozone is highly corrosive, the poor-quality materials will result in ozone leaks
  • It is important to note that materials will react different to “Dry” and “Wet” ozone

Bottom Line

The examples about materials resistance to ozone oxidation shown above should only be used as a guide. Certain materials will react differently to ozone in wet and dry conditions. Materials will also react differently when ozone concentrations are higher or lower. You can ask us any questions you might have about the materials used in your application; we would be happy to assist.