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#211213 - 05/22/04 04:59 PM Rubber Lubricant?
pbonsalb Offline


Registered: 04/14/04
Posts: 17
Loc: Concord, NH
What is a good lubricant to use on rubber, like hoses and o-rings? Will grease deteriorate the rubber? Is a cream soap acceptable? Is vaseline best?

Thanks,

Philip Bradley

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#211214 - 05/22/04 06:31 PM Re: Rubber Lubricant?
Pablo Offline


Registered: 10/28/02
Posts: 46810
Loc: Duvall WA - Pacific NW USA
I would generally avoid petroleum based greases and go with a silicone grease such a Silglyde. Soap would be a good, but temporary lube.

I'm not sure if vaseline is the best, I honestly haven't used it much, nor have I heard about it generally attacking rubber as some oil based products do.

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#211215 - 05/22/04 07:59 PM Re: Rubber Lubricant?
FowVay Offline


Registered: 06/02/02
Posts: 2276
Loc: Southeastern USA
companies such as Parker sell rubber lubricants specifically for O-rings. If you have rubber exposed to the atmosphere then plain old talcum powder is used by nearly every rubber manufacturer to prolong the life of their product while in storage.

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#211216 - 05/22/04 08:14 PM Re: Rubber Lubricant?
jthorner Offline


Registered: 07/11/03
Posts: 1130
Loc: California
Silglide silicone grease works very well. NAPA and other auto parts stores carry it. Excellent for keeping automotive weatherstrips in good condition as well. A tube belongs on every mechanic's shelf IMO.

Vaseline would be a bad idea as that is petroleum based and can rot some rubber formulations.

John

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#211217 - 05/23/04 02:16 AM Re: Rubber Lubricant?
Kestas Offline



Registered: 06/04/02
Posts: 10991
Loc: The Motor City
quote:
Originally posted by FowVay:
...plain old talcum powder is used by nearly every rubber manufacturer to prolong the life of their product while in storage.

Are you sure it's talcum powder, and not sodium stearate? Rubber has white powder on it from the sodium stearate used in manufacturing (release agent?). I don't see how talc can prolong the life of rubber.

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#211218 - 05/23/04 03:34 AM Re: Rubber Lubricant?
MolaKule Offline


Registered: 06/05/02
Posts: 15124
Loc: Iowegia - USA
A silicone-based product like Amsoil Silicon Sray is excellent for light trim.

Westly's Black Majic, a super thick silicone fluid is probably best for tires, hoses, and heavy/thick rubber.

[ May 23, 2004, 06:36 PM: Message edited by: MolaKule ]

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#211219 - 05/23/04 04:49 AM Re: Rubber Lubricant?
tom slick Offline


Registered: 05/26/03
Posts: 8719
Loc: Central Coast, Calif.
brake parts assembly lube is great and specifically designed for lubing rubber during assembly.

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#211220 - 05/23/04 06:26 AM Re: Rubber Lubricant?
labman Offline


Registered: 03/14/03
Posts: 8711
Loc: Nothern USA
NEVER put Vaseline or any other hydrocarbon on brake parts. It or grease might be OK on radiator hoses, bushings, and other things made out of modern Neoprene, Hypalon, etc. that are formulated to resist hydrocarbons. For protection and appearance sake, something thin such as Armoral made for the purpose should be good. Thicker stuff may hold dust.

For brakes and other mechanical parts, I firmly agree with jthorner, Sylglide. Watch the brake assembly lubes. I think some of the older ones were cellulose based and would be hygroscopic. Sylglide would give caliper pistons much better protection.

Rubber often is dusted with what ever is around cheap, talc or a stearate, to keep it from sticking to itself.

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#211221 - 05/23/04 07:51 AM Re: Rubber Lubricant?
tom slick Offline


Registered: 05/26/03
Posts: 8719
Loc: Central Coast, Calif.
just to add to my above post, i usually use whatever is being used in the system to lube the o-ring.
on turbine engines we use petrolatum (vaselene) almost exclusively on all o-rings, but most are made out of very chemical resistant materials, not your run-of-the-mill cheapo orings.

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#211222 - 06/20/04 12:47 PM Re: Rubber Lubricant?
Ed Offline


Registered: 08/15/02
Posts: 135
Loc: Southern California
What grease to use depends entirely on the material. You should never use silicone based lubes with silicone rubber just as you should never use petroleum based lube with conventional (petroleum based) rubber. Flourocarbon grease such as Duponts Krytox(expensive and hard to find)can safely be used just about anywhere.
Stationary "O" rings almost never need any lube but an extremely light coating sometimes aids in installation (might prevent pinching)

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#211223 - 06/20/04 07:39 PM Re: Rubber Lubricant?
Bio-T Offline



Registered: 05/27/02
Posts: 5336
Loc: London, AR
quote:
Originally posted by pbonsalb:
What is a good lubricant to use on rubber, like hoses and o-rings? Will grease deteriorate the rubber? Is a cream soap acceptable? Is vaseline best?

I use Dow Corning MolyKote 55M grease. It is a Silicone O-Ring lubricant and meets MIL-G-4343B. This stuff is very oxidation resistant and is very effective for dynamic lubrication between organic O-rings and metal parts in pneumatic systems. I use this stuff on all my hose installations and any O-ring or gasket. I have had one 5.3 oz tube for as long as I can remember.

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#211224 - 08/02/04 10:15 PM Re: Rubber Lubricant?
02supercrew Offline


Registered: 06/15/04
Posts: 244
Loc: South Dakota
quote:
Originally posted by Kestas:
quote:
Originally posted by FowVay:
...plain old talcum powder is used by nearly every rubber manufacturer to prolong the life of their product while in storage.

Are you sure it's talcum powder, and not sodium stearate? Rubber has white powder on it from the sodium stearate used in manufacturing (release agent?). I don't see how talc can prolong the life of rubber.
The white powder that you see on some rubber parts is used as a means of keeping the rubber parts from sticking together after the manufacturing process. A silicone lubricant is the best thing to use for lubrication of rubber parts.

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#211225 - 10/14/04 02:16 PM Re: Rubber Lubricant?
gmttr1 Offline


Registered: 08/17/04
Posts: 27
Loc: Pittsburgh, PA
VetteMan:
Do you know of any local retail sources for the Molykote? I have seen it mentioned in many manufacturer's factory repair manuals and I am sure it is good stuff.
Thanks.

quote:
Originally posted by 59 Vetteman:
quote:
Originally posted by pbonsalb:
What is a good lubricant to use on rubber, like hoses and o-rings? Will grease deteriorate the rubber? Is a cream soap acceptable? Is vaseline best?

I use Dow Corning MolyKote 55M grease. It is a Silicone O-Ring lubricant and meets MIL-G-4343B. This stuff is very oxidation resistant and is very effective for dynamic lubrication between organic O-rings and metal parts in pneumatic systems. I use this stuff on all my hose installations and any O-ring or gasket. I have had one 5.3 oz tube for as long as I can remember.

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#211226 - 08/19/05 09:51 AM Re: Rubber Lubricant?
PolySi Tech Guy Offline


Registered: 08/15/05
Posts: 3
Loc: NC
PolySi Technologies is a Distributor of Dow Corning Automotive products, and has this product available for sale, along with a full line of silicone greases and lubricants we manufacture. Please visit our website at www.polysi.com for product and ordering information.

Brandon Ruiz-Sales
PolySi Technologies, Inc

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#211227 - 08/18/05 10:04 PM Re: Rubber Lubricant?
Bio-T Offline



Registered: 05/27/02
Posts: 5336
Loc: London, AR
Thanks PolySi Tech Guy for posting this. I have been using the Dow Corning 55M for over 20 years. I use it on any O ring that I encounter. Also I use it on the rubber edges of flat panel air cleaners. Excellent product.

Ironic that this came up, but I just used it on one of my faucets, on the O rings, in my TT and no leak since.


[Cheers!]

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