SpudFiles

Posted: **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

) again.

Regards
Soren

Posted: **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.

Posted: **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

Posted: **Thu May 22, 2008 4:54 pm**

Lithium based Grease, that's your stuff.

Posted: **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?

Posted: **Fri May 23, 2008 6:25 am**

Hi,

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

Regards
Soren

Posted: **Fri May 23, 2008 6:52 am**

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

You can use normal car fat/grease too.

Posted: **Fri May 23, 2008 7:37 am**

try dish soap... or maybe vasoline

Posted: **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.

SpudFiles

KY Jelly boiling and sticking check valve

KY Jelly boiling and sticking check valve