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In a message dated 4/24/00 11:08:28 PM Central Daylight Time, 
s_lindblom@co*.co* writes:

<< Plain old nitrile/Buna-N. Viton is just another solution looking for a 
problem. >>

I have never been a fan of Viton.  I have used it in industrial applications 
when it was clearly called for (long-term exposure to oxidizers) but it is 
poorly suited to most diving applications.  Its biggest drawback is its poor 
resistance to wear.  You can expect a Viton O-ring to fail in a tenth the 
time of a nitrile one in dynamic applications.  The exposure of our diving 
equipment to oxygen is minimal -- only a few hours at a time.  About the only 
seal that is exposed to high O2 for extended time is the tank O-ring on an O2 
bottle.
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