Low temperature/pressure o-ring lubricant
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Posted by: bilbat ® 09/17/2003, 14:29:59 Author Profile Mail author Edit

I am looking for an o-ring lubricant for pneumatic valve applications(dynamic seal)operating from -50 to +150 degrees Fahrenheit & 0-150 psig operating pressure. Currently I am using Dow Corning 55, a Lithium soap thickened silicone grease with rubber swell additives. The viscosity of this lubricant changes significantly with variances in temperature. This variance is contributing to valve performance issues at low temperature. Does anyone have any suggestions? Thanks ~Bill ~Bill

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Re: Low temperature/pressure o-ring lubricant
Re: Low temperature/pressure o-ring lubricant -- bilbat	Post Reply	Top of thread	Forum

Posted by: cragyon ® 09/18/2003, 18:51:11 Author Profile Mail author Edit

Wow, -50 Fahrenheit, that is your challenge.  Most elastomer lubricants are rated  -20 F  to + 180 F. Check out Parker Super-O-Lube.  It is a High viscosity silcone fluid rated -54 deg F to + 204 F. With light application, -65 F to +204 F.  You did'nt mention your elestomer material, so, check for capatability between the lubricant and the elastomer.

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Re: Low temperature/pressure o-ring lubricant
Re: Re: Low temperature/pressure o-ring lubricant -- cragyon	Post Reply	Top of thread	Forum

Posted by: bilbat ® 09/19/2003, 08:25:29 Author Profile Mail author Edit

Oh, yea! The material is Buna-N. Thanks for responding, I will try Super-O-Lube. I found a "performance lube" called Krytox made by DuPont. The advertizing states "minimum viscosity change over wide temperature range (-103 to 800 degrees Farenhiet)". That's quite a claim! I work in the railroad industry. Generally speaking we expect specified operation between -40 & 150 degrees F and back-up operation to -50 degrees F. We seem to have difficulty at lower temperatures, mostly due to loss of resilience in the sealing material. ~Bill

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