Buna-N or Butyl with DME/Propane 1

[nonobaddog]

I have a customer that uses a Butyl rubber gasket in an application with a 80/20 mix of DME and Propane. The gasket does not provide a sufficient seal as there is evidence of major leakage. I think that a Buna-N gasket would work better.
I am trying to find some reference materials that support, or even disprove my idea. I have found documentation that suggest that the propane and butyl are not a good match but can't find much of anything on DME's compatability with various rubbers.

 

[GrahamBennett]

According to my information your client has a choice to make. Viton and NBR are ranked as satisfactory for use with both propane and dimethyl ether. Sorry, I cannot help you with actual grade selection of these broad polymer families.

 

[nonobaddog]

I did some testing, looks like the NBR is the way to go, the Viton material actually swells quite a bit while in contact with the mix. Thanks.

 

[GrahamBennett]

Thank you for the feedback. I've learnt something too.

 

[GrahamBennett]

Oh, and thank you for the star.