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Yeah, but the polyurethane o-rings that come stock in, e.g., Sherwood valves, are even better than viton in withstanding O2 degradation, yet a "technical" dive shop will charge you money to take them out and replace them with viton, which is inferior. John Trout wrote: >Based on observations in the chemical industry involving oxygen >applications, the fact that every resource on materials compatibilty I have >ever seen says viton is superior to buna-n in oxygen service and the fact >that viton o-rings are only slightly more expensive than buna-n,if any at >all, I wonder, why not use viton? ------------------------------------------------------------ John H. Heimann Sr. Product Manager Oracle Corporation Security Products 500 Oracle Pkwy, Box 659410 415-506-9750 (phone) Redwood Shores, CA 94065 415-506-7226 (fax)
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