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oil on o-rings?

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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oil on o-rings?

Unread postAuthor: marpat » Sat Nov 29, 2008 6:13 pm

i just bought a 20 oz paintball co2 tank at cabelas
the urethane o-ring on it seemed dry so i was wondering if it would be safe to put a little rem oil on it to help seal better
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Unread postAuthor: pocket » Sat Nov 29, 2008 11:12 pm

no it will eat the urethane use vasalene it will let it slide on and also improve the life of the o-rings
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Unread postAuthor: SEAKING9006 » Sat Nov 29, 2008 11:35 pm

Use mineral oil.
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Unread postAuthor: pocket » Sat Nov 29, 2008 11:56 pm

mineral oil would destroy the o-rings like look what it does to urethane based paints it eats away at them cuz thats essentially what paint thinner s ^^
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Unread postAuthor: SEAKING9006 » Sat Nov 29, 2008 11:58 pm

It says on a lot of markers to use mineral oil as a lubricant. Like mine.
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Unread postAuthor: Ragnarok » Sun Nov 30, 2008 12:09 am

pocket wrote:no it will eat the urethane use vasalene it will let it slide on and also improve the life of the o-rings

Vaseline can do exactly the same to seals, being a petroleum product.

It's usually unwise to use petroleum oils in a high pressure environment. Now, it's unlikely to be a problem with CO2 (being inert), but it's not a good idea to get into, because you might make the mistake of using it in a pressurized air situation, and it can be dangerous in those cases, given the increased density of oxygen around.
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Unread postAuthor: Daltonultra » Sun Nov 30, 2008 12:53 am

The big problem with using any possibly flammable oil in a high-pressure app is that sudden increases in pressure can cause it to "diesel".

My Father made the mistake of using regular gun oil in his break-barrel pellet pistol. Every so often, the oil explodes when the spring suddenly pressurizes it, exactly like a diesel motor. The thing kicks like a .45 when that happens.
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Unread postAuthor: biged » Sun Nov 30, 2008 7:54 am

A pure silicone based lubricant will not harm o-rings of any type.

Silicone Oil: Paslode nail gun oil, $8 a bottle (home depot), great overall lubricant. Thick and sticky.
Silicone Grease: Dielectric Silicone grease, $9 a tube, (automotive stores), great grease.
Silicone Spray: Look for a "Food Grade" silicone spray. Some non-"food grade" silicone sprays will have harmful additives which will break down and deteriorate rubber quickly. Sprays are just a dry lubricant and not really suited for o-rings.

///ed///
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Unread postAuthor: MaxuS the 2nd » Sun Nov 30, 2008 11:13 am

Or a Lithium based product.
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