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Does the nitrile last longer than rubber? I have quite a few custom calls that the black rubber o-ring has dry rotted, cracked, and fell off. That's why I've always stuck with castration bands.
If the black bands you have cracked or dry rotted, they could have been high content nitrile or rubber based. Castration bands will also crack and dry rot if exposed to high temps and sunlight. Generally nitrile will last almost as long or longer than real rubber and given that rubber seals are almost nonexistant now it's hard to tell what you might have had.
Air conditioning o-rings are generally neoprene, cloroprene, low nitrile or silicone filled synthetic elastomers. These bands are made for industrial solvents, hydraulic oils, and freon, etc and are much more resistant to weathering. The silicone elastomer o-rings are even more resistant to weathering but don't have as much stretch or scuff resistance. They will all usually last a very long time unless left in direct sunlight or high temperatures for extended periods! /ubbthreads/images/graemlins/smiliesmack.gif
I edited my first post to remove: "Nitrile" for better clarity and accuracy. Nikonut
About as clear as mud isn't it! /ubbthreads/images/graemlins/smile.gif Just keep a few spares and you will be good to go! /ubbthreads/images/graemlins/grin.gif