Gallery, Projects and General > How do I??

Petrol-proof O-rings

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awemawson:
Beware of Viton rings near heat - iirc they break down and produce phosgene gas  :bugeye:

Manxmodder:

--- Quote from: Bluechip on November 26, 2014, 07:39:09 AM ---AFAIK 'Viton' rings are proof against petrol. No idea what lighter fuel is so .... ??

I get mine from Simply Bearings.

Here is their site and if you poke the 'info'  [ Chemical Resistance Table ] thing you'll get an overview of various o-ring materials.

http://simplybearings.co.uk/shop/index.php?cPath=4501_4706

Dave

--- End quote ---

Lighter fluid is usually naphtha,a high volatile fuel also known as white gas.
http://en.wikipedia.org/wiki/Lighter_fluid

dawesy:
Nitrile or fluorosilicone should be fine also.

Manxmodder:

--- Quote from: awemawson on November 26, 2014, 08:21:40 AM ---Beware of Viton rings near heat - iirc they break down and produce phosgene gas  :bugeye:

--- End quote ---

Never heard of them emitting phosgene gas but the danger we were taught relates to the constituents of the viton fluoroelastomer being converted to hydrofluoric acid if the seal or O ring is heated above 300 degrees celsius(that's very hot).

The standard advice when handling viton O rings that have been used in extreme high temp applications is to wear disposable gloves,or use a tool such as tweezers.

I found this health and safety document which seems to say a lot of the fears are overstated
http://www.hse.gov.uk/mvr/topics/fluoroelastomers.htm
.....OZ.

Lew_Merrick_PE:
Lighter fluid is naptha.

EPDM o-rings should do just fine for you.  That is the preferred solution for jet fuel (kerosene) and a number of other evil nasties.  Nitrile should also work well, it just may need to be replaced more often.

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