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http://www.dupontdow.com/products/viton/products/default.html http://www.dupontdow.com/products/default.html http://www.parker.com/parkersql/default.asp?type=2&id=66 http://www.parker.com/o-ring/products/compounds.htm http://www.parker.com/o-ring/products/fluorocarbon.htm Thomas, while brief, is correct. All these links will get you to more information than anyone ever wanted to know about o-rings. Material differences in o-rings have almost no direct correlation to "hardness" or density. You can have 6 o-rings of the same material, of 6 different hardness and density factors. You may have o-rings with identical physical characteristics, yet made of entirely different compounds. The compounds used are infinitely adjustable by the chemical engineers for a dizzying variety of performance characteristics. Often what a manufacturer uses for a particular application is decided as much by economic concerns as reliability or suitability. If you take the time to educate yourself, you will learn that good old hardware store o-rings work fine for 99.9% of SCUBA applications. Empirical information suggests that "standard" (read the links and you will learn there is no such beast) Buna or Nitrile o-rings, used in breathing gas service, and exposed to hi FO2 conditions, get brittle and turn to "sand" after prolonged exposure (1 to 2 years). If you have the time and money to educate yourself, and to purchase the proper material and hardness for your intended application, you can certainly find some high performance o-rings. Or, you can be like most of us lazy dogs, and use the hardware store cheap ones, and change them once a year whether they need it or not. <g> Scott > -----Original Message----- > From: Thomas Tukker [mailto:tukker@be*.ne*] > Sent: Tuesday, January 16, 2001 2:29 AM > To: joerad@te*.co*; techdiver@aquanaut.com; > cytech@ma*.co*.cy* > Subject: RE: o rings > > > Bullshit. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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