Gas and liquid post o ring material

[marc1]

What are the best materials for these? Is there anything better than the generic black ones? I see there are silicone ones, but silicone has high oxygen permeability, so I don't think that those are ideal.

 

[NTBeer]

Silicone also is softened by keg lube, so stick with buna N.

 

[marc1]

Silicone also is softened by keg lube, so stick with buna N.

Are the basic black ones nitrile/buna N?
Like this one:
Beer & Gas Quick Connect - Replacement O-Ring | MoreBeer

 

[NTBeer]

Yes it is. You can get a pack of 100 for less than $6 on Amazon. Search "111 o ring".

 

[marc1]

Yes it is. You can get a pack of 100 for less than $6 on Amazon. Search "111 o ring".

Is there anything that would make some food grade and some not?

 

[MikeCo]

Buna N is much more abrasion/tear resistant than silicone. I personally don't see any reason to use silicone o-rings anywhere on kegs.

 

[day_trippr]

I agree with ^all that^ - along with the "keg lube dissolves silicone" thing.
Having tried some out many years ago (the baby blue ones) and eventually finding them dissolved inside my QDs, that was the end of that experiment...

Cheers!