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912 o-rings

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dlj04(at)josephson.com
Guest

Posted: Mon May 16, 2016 11:54 pm Post subject: 912 o-rings

On 5/17/16 12:02 AM, RotaxEngines-List Digest Server wrote:

  on 912 O-rings



 	  Quote: 	
		   From: "Roger Lee" <ssadiver1(at)yahoo.com>

 There is an "O" ring at the base of the cylinders. See Parts manual section

 72-20-00 pg. 16. Item #14 and part #250510. It is a Viton 87mmx2mm "O" ring. I

 buy my "O" rings from Maryland Metrics


	


Thanks Roger and Richard. Viton or Buna-n?



David

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Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Tue May 17, 2016 5:27 am Post subject: Re: 912 o-rings

Viton

Copy and paste info:

Viton and Buna seals have several very crucial differences that make them especially well suited to certain applications. While both Viton and Buna seals both serve as great sealing options at moderate temperatures, Viton is far superior to Buna for high temperature applications. Viton seals provide an indefinite seal for temperatures up to 400°F, and for temperatures up to 600°F they offer an excellent seal for more than 48 hours. Buna on the other hand is only effective up to 250°F. However, Buna seals provide a low temperature sealing option with effective sealing down to temperatures of –22°F, while temperatures below 5°F render Viton seals ineffective as they become quite hard and inflexible.



Along with temperature, other environmental conditions differentiate these two seals. An exceptionally broad range of chemical resistances make Viton seals a perfect option for most applications involving oils, fuels, and mineral acids, and these seals also boast excellent resistances to oxidation, ozone, UV exposure, weather, fungus, and mold. While also boasting some chemical resistances, Buna is much less universally resistant than its Viton counterpart suffering degradation from weather and ozone exposure. For most circumstances, however, this is not an issue, and Buna seals also offer the benefit of superior abrasion and tear resistance making them more suitable for more heavy duty industrial applications.



- See more at: http://www.humphrey-products.com/content/viton-vs-buna-which-seal-for-your-applications#sthash.tnt528Om.dpuf

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_________________
Roger Lee
Tucson, Az.
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Light Sport Repairman
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