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PostPosted: Thu Jul 08, 2021 4:50 pm 
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Location: Chilliwack, BC
In case someone isn't aware, unlike oils which come in various viscosities (thicknesses), grease is not simply really thick oil, but is of two parts.

Grease is much like a sponge which contains a liquid.

When considering or specifying grease for some application, one needs to take into account the lubricant (oil) and the carrier or "sponge".

A lithium grease is more properly described as a lithium soap (carrier) grease which contains/carries the specified oil.

In the case of lithium greases, IME, all contain oil in a lithium soap carrier. Oil is combustible and potentially explosive under diesel conditions. An older grease or grease used outside of it's service may ooze of weep liquid oil as anyone who has inspected old grease will have noticed.

It is my understanding, but not confirmed in direct conversations with petroleum engineers, that some silicone greases are simply very thick material, not carrier and lubricant, but that doesn't matter for our applications.

FWIW, I use both silicone dielectric grease (not because it's magic but because it works and I have small tubes to take to the range) and Permatex Industrial Super Lube. because it works and comes in bigger tubes.

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PostPosted: Fri Jul 09, 2021 8:32 am 
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I would never use super lube on pcp airgun seals nice thing about getting lube from dive shop you just know its the stuff

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PostPosted: Fri Jul 09, 2021 9:03 pm 
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Ok so lithium grease is combustible I'll just stick with the silicone grease


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PostPosted: Sat Jul 10, 2021 9:18 am 
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Ravenairgun wrote:
Ok so lithium grease is combustible I'll just stick with the silicone grease


Yes 100% silicone grease use just that .Plumbers grease for o rings is good its 100 % and yes there is other produce's but it gets people confused .....Just make the oring shiny with the greases no more ....

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PostPosted: Sat Jul 17, 2021 9:38 pm 
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https://www.dupont.com/products/molykot ... rease.html

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PostPosted: Sun Jul 18, 2021 10:11 am 
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GarthThomas wrote:
https://www.dupont.com/products/molykote-33-medium-extreme-low-temperature-grease.html


I just looked this up it dose not mention high pressure application

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PostPosted: Sun Jul 18, 2021 5:12 pm 
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I bought a tube of Silcolon (PTFE) grease & use that. It's synthetic & says it is: NON-STAINING, DIELECTRIC & CLEAN
NLGI GRADE 2
It's shiny, almost transparent/whitish in colour - it's semi-clear, I guess.
I thought I got it at Canadian Tire, but might have been a Home Hardware store.

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PostPosted: Sun Jul 18, 2021 5:19 pm 
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If pure silicone is recommended without additives and generally assumed to be non-flammable why would anyone want to mix something else with it and risk their lives and limbs to an explosion and is beyond me ,


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PostPosted: Sun Jul 18, 2021 6:01 pm 
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Daryl wrote:
I bought a tube of Silcolon (PTFE) grease & use that. It's synthetic & says it is: NON-STAINING, DIELECTRIC & CLEAN
NLGI GRADE 2
It's shiny, almost transparent/whitish in colour - it's semi-clear, I guess.
I thought I got it at Canadian Tire, but might have been a Home Hardware store.

Well i work with med gas and if it don't say high pressure i don't use it

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PostPosted: Sun Jul 18, 2021 8:13 pm 
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Didn't someone say if it said DIELECTRIC - was silicone?
I'm confused.

this is where I saw that.

airmec wrote:
I used this when I rebuilt my PCP rifle, also use it on all my airguns that have Orings, dielectric grease is silicone grease. About 8$ at your local CT.

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PostPosted: Tue Jul 20, 2021 11:22 am 
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Read this http://www.differencebetween.net/techno ... ne-grease/

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PostPosted: Tue Jul 20, 2021 12:19 pm 
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lauchlin wrote:


Hi Brent, I did a bit of research and in the MSDS for Permatex dielectric grease they say it's made from POLYDIMETHYLSILOXANE, which is the same ingredient that they talk about in your link (for silicone grease).

https://www.permatex.com/products/lubri ... nfo_custom

I have used this grease in 4500 psi application without any issues.

I know you like when one speaks from facts :) :wink: . Hope this helps clear things out, at least for this specific product 8) . Cheers!

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PostPosted: Tue Jul 20, 2021 12:41 pm 
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this grease has a flash point of 200 degrees Fahrenheit


https://www.permatex.com/products/lubricants/specialty-lubricants/permatex-dielectric-tune-up-grease-4/?locale=en_us#tab-tech_doc_info_custom


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PostPosted: Tue Jul 20, 2021 1:12 pm 
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I am aware of other lubes that are safe...... But so many times i hear some one has used something that's not safe permatex can be a lot of different lubes some not safe i all ways say divers grease can't get it wrong . It would be nice to have a list people could refer to .....

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PostPosted: Tue Jul 20, 2021 2:48 pm 
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Location: Kingston, ON
pelsby wrote:

No, it has a flash point of >260C or 500F, and a working temp of 400F which is the same for all pure silicone grease.
Plumber's grease or Divers silicone grease or that Permatex dielectric are safe. Dow high vacuum silicone grease is also safe. I have used the Dow stuff for years, but this thread prompted me to look up the tech specs, and I notice it contains a small amount of silica as a thickening agent. Although non combustible, it is basically sand and not something you necessarily want to put on moving parts, say o-rings in a HPA pump.
So, I'm going to get some plummers grease, it's cheap and safe and sold eveerywhere.

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