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Guys,

I would like to apologize for have omitted the first words when I did
the copy and paste of this text.
The first words are :

"Advisory : Some manufactures Recommending Against Viton in Life Support
Equipment".

It was not my intention start the third world war here!

Zeca

By the way, maybe it could happen in the future in the PADI "ESASA" (
Enriched Supplied Air Snorkeling for Adults) program.


Rob Sluys wrote:
> 
> What sort of numbnuts dumbf**k wrote this?The sarcasm is running rampant in
> my head right now, but I'm at a loss for that perfect chip of wit that
> would sum up my thoughts.  Suffice to say that I think there's a general
> consensus on this list about not breathing from flaming regs underwater...
> 
> ~Rob Sluys
> rsluys@nm*.ed*
> 
> Zeca Wrote:
> 
> "Several scuba manufactures now recommend against using Viton o-rings in
> any equipment used for production or delivery of breathing gases. The
> concur is that when Viton combusts, it releases a gas compound that is
> highly toxic in even trace amounts.
> In most circumstances, Viton is one of most oxygen-tolerant o-ring
> materials, making the probability of a combustion reaction exceedingly
> low. This is why, until now, it was considered an optimum material for
> o-rings in high oxygen equipment, such as those used for the production
> od enriched air nitrox, and for breathing enriched air nitrox or oxygen.
> However, because Viton combustion in breathing equipment can be lethally
> toxic, several manufactures now recommend against it, even thought Viton
> combustion is highly unlikely. Alternative material o-rings do not
> resist combustion quite as well as Viton, but do not pose the same
> toxicity risk and are still unlikely to combust in otherwise oxygen
> clean and compatible equipment. For specific recommendations regarding
> the use of Viton and information about suitable alternatives to Viton
> o-rings in breathing equipment, contact the manufacture of the equipment
> in question."

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