Today's Message Index:
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1. 12:54 AM - Re: 912 o-rings (D L Josephson)
2. 06:28 AM - Re: 912 o-rings (Roger Lee)
Message 1
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On 5/17/16 12:02 AM, RotaxEngines-List Digest Server wrote:
on 912 O-rings
> From: "Roger Lee" <ssadiver1@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
Message 2
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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 400F, and for temperatures up to 600F they offer
an excellent seal for more than 48 hours. Buna on the other hand is only effective
up to 250F. However, Buna seals provide a low temperature sealing option
with effective sealing down to temperatures of 22F, while temperatures below
5F 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
--------
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=456330#456330
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