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Steve,

Viton o-rings come in black and brown and Nitrile (Buna-N) are also black.
A good way to tell them apart ( if you have spares) is to try to ignite one
with a lighter.  Nitrile will burn and Viton will slowly melt and not
ignite.  ie: this is why Viton is better for Nitrox.  Another factor
effecting the performance of o-rings is the durometer.  Viton comes in 75
and 90 durometer.    I have found that the 75 durometer o-rings extrude and
also swell a lot  in size in applications were cylinder pressures are
3000-3400 psi and the 90 durometer Viton o-rings hold up to the pressure
much better.  I use 90 durometer Viton our check valve application.

Jan Troup
Aquavit, Inc.
aquavit@aq*.co*
1-877-278-2848




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