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KY Jelly boiling and sticking check valve

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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KY Jelly boiling and sticking check valve

Unread postAuthor: dongfang » Thu May 22, 2008 3:13 pm

Hi,

Has anybody else experienced heat resistance problems with KY Jelly or the like (silicone oil) as a lubricant?

I used it in my new homemade pump. Today was the SECOND time it boiled, and turned into a white sticky material (like 3/4 hardened epoxy) that caused my check valve to stick open. That always happens when I have got around 4 bar in the chamber ...

I guess I have to find something else for that pump. Never going to use KY (for the pump :roll:) again.

Regards
Soren
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Unread postAuthor: Hotwired » Thu May 22, 2008 3:31 pm

Eh, use good old engine/bike oil, KY jelly is not a mechanical lubricant. Well machine lubricant at any rate.
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Unread postAuthor: psycix » Thu May 22, 2008 3:59 pm

Hotwired wrote:Eh, use good old engine/bike oil, KY jelly is not a mechanical lubricant. Well machine lubricant at any rate.


Use real mechanical lubricant if you can, but do note that some types may eat your o-rings
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Unread postAuthor: MaxuS the 2nd » Thu May 22, 2008 4:54 pm

Lithium based Grease, that's your stuff.
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Unread postAuthor: jrrdw » Thu May 22, 2008 6:13 pm

White lithium greese resist water. Commonly used in boat trailer wheel bearings. This brings up a interesting question. Do pneumatic cannons built condensation drops inside the chamber/s?
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Unread postAuthor: dongfang » Fri May 23, 2008 6:25 am

Hi,

I don't find lithium grease here, but I guess I got to look harder...

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Soren
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Unread postAuthor: Necrosis » Fri May 23, 2008 6:52 am

If only JSR was here to see this topic...

You can use normal car fat/grease too.
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Unread postAuthor: trae08 » Fri May 23, 2008 7:37 am

try dish soap... or maybe vasoline
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Unread postAuthor: Gippeto » Fri May 23, 2008 9:00 am

I understand why water based lubricants would "boil" (but @ only 4Bar?), but I'm very surprised that silicone oil didn't work.

DC200 50CS has a service temp of -40C to 200 C

Anyhow, I have been using whatever oil (petroleum based) was at hand without problems. Ranging from 10wt to 20w50.
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