Premature Deterioration of Ozone Diffuser Gaskets – Request for Support

[BSMEclassof2012]

Dear Engineer,


We have recently observed premature failure of the ozone diffuser gaskets. These gaskets are stocked and used accordingly. Operating temperature is around 70 F.


Historically, they have lasted around 3–5 years in service but we have started seeing failures after just 1 year. The material is becoming gummy and is no longer sealing properly.

The Viton used was grade "A".

Can you tell if grade A Viton is chemically compatible for this application? What other factors can be involved that can give this kind of failure?

 

[EdStainless]

If they are the correct polymer my hunch is that the compounder changed some ingredients.
Different fillers (maybe just different brands) or different curative chemcials.
We used to have difficulty in hot water service because of issues like this.
Viton should work and EPDM or silicone should work also.
Provided that your concentrations are not above 20-25%