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Old 19-08-09, 07:37 AM   #1
thor
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Default What grease to use between plastic and alu?

Copperslip ok? Lithium? Will be in a shielded environment with little access so must last.

Thanks is advance!
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Old 19-08-09, 08:22 AM   #2
timwilky
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Default Re: What grease to use between plastic and alu?

The fact you feel the need to grease it would suggest it is a bearing surface, ie the components move relative to each other, so never ever copperslip. especially with two such soft materials.

Old fashioned LM then
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Old 19-08-09, 11:29 AM   #3
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Default Re: What grease to use between plastic and alu?

Quite, big thing to remember is that copperslip is not 'grease' but anti-seize. It can create a fair bit of wear if used as grease.

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Old 19-08-09, 12:04 PM   #4
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Default Re: What grease to use between plastic and alu?

Understood. Glad I asked now!

TimWilky - What is "LM"?

Thanks!
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Old 19-08-09, 12:05 PM   #5
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Default Re: What grease to use between plastic and alu?

LM = lithium multipurpose
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Old 19-08-09, 12:10 PM   #6
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Default Re: What grease to use between plastic and alu?

Quote:
Originally Posted by thor View Post
Understood. Glad I asked now!

TimWilky - What is "LM"?

Thanks!
Lithium based grease, general purpose, good for most automotive applications such as wheel bearings etc. works across a wide temperature range. should be found in all workshops
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Old 19-08-09, 12:16 PM   #7
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Default Re: What grease to use between plastic and alu?

*bows*

Oh mighty org - thou art benevolent

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Old 19-08-09, 12:23 PM   #8
timwilky
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Default Re: What grease to use between plastic and alu?

Straight out of the castrol web site

Castrol LM Grease
Lithium based, high melting point grease, specifically designed as a wheel bearing grease for use over a wide range of temperatures. Also suitable for general purpose applications

Castrol Red Rubber Grease
A special, rubber compatible grease for use on hydraulic brake and clutch components where hardening or swelling of rubber must be avoided.
Useful in assembly of rubber components for brake, clutch and suspension units

Castrol BNS Grease
A non-melting grease, designed primarily for use in anti-friction bearings operating in high temperature conditions. Ideally suited for competition use

Castrol Moly Grease
High melting point, lithium based grease containing molybdenum, providing dry lubrication under extreme operating conditions.
Ideally suited for the following applications; King pins and bushes, shackles and suspension trunnions, bevel worm and peg steering boxes

Castrol L/EP0
Lithium based, semi-fluid grease. Ideally suited for use in grease packed differentials and gearboxes requiring a semi-liquid, self-levelling grease

Castrol Graphited Grease
A soft, waterproof grease, developed for the lubrication of springs and chains. Based on a high viscosity oil with a low melting thickener, it contains colloidal graphite for additional load carrying.
The graphite prevents metal-to-metal contact under shock loading conditions

Castrol CL Grease
A soft, tacky, calcium based grease. Formulated from highly refined mineral oil incorporating an adhesion additive.
It has natural resistance to water and good protection against corrosion.
Primarily recommended for chassis lubrication but also suitable for swivels and shackles

Castrol Impervia MDX
Soft, tacky grease, containing additives which give it excellent adhesion to metals.
Suitable for high temperature, high load applications including shock loading conditions
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Old 19-08-09, 10:32 PM   #9
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Default Re: What grease to use between plastic and alu?

Your description of the application is too vague to get a really useful recommendation.

What is the plastic? What is the "aluminium"? What loading, temperature, exposure to water, relative movement of parts, rotating/sliding speeds, reciprocating etc etc ?

Relatively few "plastics" like mineral oils/greases much over long periods (exceptions are things like nylon (polyamides), delrin (acetals) etc), and silicone based lubes can be a safer bet.
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