Centre stand O-rings

[roddy]

Evening folks,

doing a bit of general maintenance and found the centre stand o-rings on the stand bearing in a poor condition, so the question is

will Nitrile O-rings be fine or do I need the Viton material ? I would have thought the Nitrile would be fine since there not in a high temp/ corrosive enviroment (IE fuel) any advice ?

cheers

 

[dancata]

I changed and lubed them last summer, after the part that you press with your foot broke down (it was rusted on ~ 75% of the surface, where it meets the stand).

The o-ring dealer did not mention the material they ware made of, but I guess that the most important is heat coming from the exhaust.

Dan.

 

[roddy]

Looks like Nitrile will be fine, I finally found a site that listed the differences and it's not as a huge as I thought, see below

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Nitrile Rubber is still the most widely used elastomer for orings.



It has an excellent resistance to petroleum based oils and fuels, silicone greases, hydraulic fluids, water and alcohols. It has a great balance of working properties such as low compression set, high tensile strength, high abrasion resistance, combined with a low material costs.

* Buna N
* Stanard Temp Range -40 C to +135 C
* Shore Hardness - 75 (Standard)
* Colour - Black



Viton® orings have exceptional resistance to high temperatures Upto 200 Degrees celcius & agressive fuels & chemicals. Viton is now commonly used on orings, as well as rotary shaft seals & gaskets due to these reasons.

* Viton®
* Standard Temp Range -40 C to 200+ C
* Broad Chemical Resistance
* Superior Thermal Stability
* Colour - Brown / Green
* Shore Hardness - 70 to 90

 

[ELIMINATOR]

News to me that Nitrile and Viton are not both black

Where I used to work both types were used, had to be correctly identified by keeping in lightproof packets clearly labelled, as once they were together there was no way of differentiating between them.

Viton was used for aggresive fuels, like tallow.

 

[roddy]

News to me that Nitrile and Viton are not both black

never noticed that, I know the Vitron one's we use in work (medical equipment) are either Green or Black ? Maybe it just depends on where they're manufactured ?

 

[Packer]

I'll be replacing mine as well. Where did you source yours Roddy?

I now have an engine and transmission on blocks on the garage floor

Next step seperate those as well.

 

[roddy]

Sorry Kevan missed this

I got the O-rings from The Bearing boys