Originally Posted by klm4755
The O-rings were from manufacture DID and were from spare master links (what I had available). I do not know their material composition. I assume some type of rubber compound and that all vendors O-rings would be fairly material consistant. If you can tell me a (simple) way to test the spare O-ring to determine it's compound let me know and/or perhaps other members will chime in.
No I don't but a number of years  ago the o-rings I used to use in my profession went to silicon from rubber...silicon lasts a lot longer and less UV damage..that is why I asked..just curiosity..you are correct I will bet that all o-ring chain manuf use the same material and I will also bet it is silicon..
Good job on test...but you have WAY too much spare time!
2007 R1200GS Adventure " ...to explore off-road, alone in my case, way out in the boonies...that feeds the soul!"
After 2014 BOM my bike is forthwith the "GS McGee"!