200A and 202 reproduction
frames back
in stock.

ctuan13

With my recent acquisition of a 222B, I have recently immersed myself in easi-lite valve o rings and the various issues, replacement o ring compositions and etc.  

I have seen many posts here commenting on how Viton works better at resisting heat, but is poorer in cold performance.  But based on these data tables, flourosilicone is not only far better in cold resilience but has a higher upper temperature limit.  About the only ways viton seems to do better than flourosilicone is mechanical wear resistance and compression resistance and only marginally.

Not sure it means much, but just thought it was interesting!

 

http://www.allsealsinc.com/Material-Selecting-Rubber-Compounds.html

Chuck
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Gasman64
Both interesting and helpful, Chuck, thank you.
Steve
ICCC #1012

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salukispeed
I was familiar with Silicone and its poor resistance to fuel but flourosilicone Is new to me? Thanks. 
Bob
ICCC 1868
Perfection appreciation #10
Milspec 65252
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Chucker
When one flurosilicone O-ring cost around $2.75/pc., I'll stick with Viton. MUCH more for my money and they work. 

https://www.ebay.com/itm/036-Fluorosilicone-O-Ring-70A-Durometer-Blue-2-364-ID-2-1-2-OD-Pack-of-25/291334470599?hash=item43d4e33bc7:g:En4AAOSwyZ5UmY9s

Viton can be purchased at 65Durometer so they 'squish' and seal better and the price goes up, of course. They are especially long lasting as fuel cap gaskets.
Chuck
"Pleasant words are a honeycomb, Sweet to the soul and healing to the bones." Proverbs 16:24
Eye-SEE-C-C Member #1333 -- MilSpecOps #003
"Michigan - from the Ojibwa word “meicigama,” meaning “great water.”
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Gunhippie
I've perused some of that same data for both Coleman and brewery use. In the brewery, we do use some harsh chemicals for cleaning, and high temps, too. We use mainly EPDM in the brewery.

Comparing the differences between Viton and Buna-N, I usually stick with Buna for Coleman stuff.
It's priceless until someone puts a price on it.
Walk a mile in a man's shoes before you criticize him--then you're a mile away, and he has no shoes.
Texan's last words: "Y'all--hold my beer--I wanta' try sumptin'."
Timm--Middle of nowhere, near the end of the road, Oregon.
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