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I have a 12 gauge Remington 1100 on the way. Figured I'd order up some spare o-rings now. I am looking at the Viton 021 o-rings on Amazon. They come in 75A and 90A Durometer. The price difference is negligible, so which is the better one to get?
Originals years ago were around 70A and I have some 40 years in guns still working fine so one can take it from there. Used a couple 75A the odd time also and no issues so far but have not shot them a lot either
I have no experience with the 90A so don't know if they will be better or worse in that application probally worse IMO
Sorry
From the old books as you know
The hardness of rubber compounds is measured by the Shore A durometer; the higher the durometer, the harder the compound. 70-durometer hardness should be used whenever possible as it offers the best combination of properties for most O-Rings applications.
Softer compounds stretch easier and seal better on rough surfaces. Harder compounds offer greater abrasion resistance and resistance to extrusion. Extrusion must always be considered where high pressure is used. The proper hardness may be selected from this chart by matching the fluid pressure with the maximum extrusion gap.
I buy o rings at a hydraulic shop -- they will match the size for you and heat resistant ones are better than Rem ones -- you can get a dozen for the price if one from Remington.
J
I'm an oringless-inertia-recoil-operated aficionado, BUT I do use orings when maintaining my scuba diving regulators (3000-4000 psi). Viton duro 75 is one of the most commonly used hardness specs. Some of the higher pressure dynamic orings may call for duro 90. The increased hardness helps against extrusion failures and premature wear. I personally choose to use duro 90 almost universally. If it seals fine with a 90, I'll leave it with a 90 even if the specs call for a 75. Duro 75's are slightly more flexible and might be easier to get into complicated places, but with a little patience and strong fingers, you can get 90s into complicated places as well.
In conclusion, orings are cheap. You can buy both hardnesses and try them out. If both perform equally well and reliably, I would use 90's because you might get a little more durablity. I buy my orings from McMaster Carr.
