Good lubricant for O rings and threads?

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CNCman
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There seems to be some conflicting info on silicon o-ring lube compatibility, and I am confused too, LOL.
Do we have any Chemical Engineers or Experts here at BLF that can clear this up ?
I found this and it looks wrong too. Tired
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https://www.parker.com/Literature/O-Ring%20Division%20Literature/ORD%205...
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2.2.13 Silicone Rubber (Q, MQ, VMQ, PVMQ)
Silicones have good ozone and weather resistance as well as good insulating and physiologically neutral properties.
However, silicone elastomers as a group, have relatively low tensile strength, poor tear strength and little wear resistance.
.
Heat resistance
•Up to approximately 204°C (400°F) special
compounds up to 260°C (500°F).
.
Cold flexibility
•Down to approximately -54°C (-65°F) special
compounds down to -115°C (-175°F).
.
Chemical resistance
•Animal and vegetable oil and grease.
•High molecular weight chlorinated aromatic
hydrocarbons (including flame-resistant insulators, and coolant for transformers).
•Moderate water resistance.
•Diluted salt solutions.
•Ozone, aging and weather.
.
Not compatible with:
•Superheated water steam over 121°C (250°F).
•Acids and alkalis.
•Low molecular weight chlorinated hydrocarbons
(trichloroethylene).
•Hydrocarbon based fuels.
•Aromatic hydrocarbons (benzene, toluene).
•Low molecular weight silicone oils.
.

Dalamar
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CNCman wrote:
There seems to be some conflicting info on silicon o-ring lube compatibility, and I am confused too, LOL.
Do we have any Chemical Engineers or Experts here at BLF that can clear this up ?
I found this and it looks wrong too. Tired
.
textileRef:16102540196104d98e53ee1:linkStartMarker:“https://www.parker.com/Literature/O-Ring%20Division%20Literature/ORD%205...
.”:https://www.super-lube.com/Content/Images/uploaded/documents/Compatabili...(PTFE).pdf
2.2.13 Silicone Rubber (Q, MQ, VMQ, PVMQ)
Silicones have good ozone and weather resistance as well as good insulating and physiologically neutral properties.
However, silicone elastomers as a group, have relatively low tensile strength, poor tear strength and little wear resistance.
.
Heat resistance
•Up to approximately 204°C (400°F) special
compounds up to 260°C (500°F).
.
Cold flexibility
•Down to approximately -54°C (-65°F) special
compounds down to -115°C (-175°F).
.
Chemical resistance
•Animal and vegetable oil and grease.
•High molecular weight chlorinated aromatic
hydrocarbons (including flame-resistant insulators, and coolant for transformers).
•Moderate water resistance.
•Diluted salt solutions.
•Ozone, aging and weather.
.
Not compatible with:
•Superheated water steam over 121°C (250°F).
•Acids and alkalis.
•Low molecular weight chlorinated hydrocarbons
(trichloroethylene).
•Hydrocarbon based fuels.
•Aromatic hydrocarbons (benzene, toluene).
•Low molecular weight silicone oils.
.

as an example, https://www.super-lube.com/Content/Images/uploaded/documents/Compatabili...(PTFE).pdf

Synthetic grease is basically artificially made vaseline without the big silica granules in it… and is considered “good compatibility” with silicone

I’m pretty sure very few if any flashlight orings use “natural rubber” and real silicone lube will blow up silicone rings so bad you will not be able to take the light apart… which leads me to believe most are also not using silicone

Responsible manufacturers would say what the orings are made of, and their dimensions…that being said, I think most of them use more overall compatible formulations.

I only like high CRI. Collection:

Fireflies NOV-MU 21 4500k E21A

Fireflies ROT66 219B SW45 D220

Fireflies E07 Copper 219B SW45k? (odd/higher lumen bin with lower r9 and higher cct?)

Fireflies E07 219B SW45k

Fireflies E07x Pro sst20 FA4 4000k (mail)

 

Varmint removal:

Convoy M21A C8 ver SST20 4000k (5a)

Convoy S2+ SST20 4000k  FB4 (3200ma)

Memes:

BLF GT94

Emisar D18 660nm SST20 (mail)

 

 

CRI test dump https://drive.google.com/drive/folders/1kcl_uOhgfpR4RSsa8F4b-UUVP9mkL6Cr...

max
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Well, once upon a time, long long ago, I worked as a Chemical Engineer and had to use a slide rule to figure things out. Note, digital calculators and computers were not invented yet. For arithmetic we got to use pencil and paper since these were invented after chisel and stone.

I do remember a few things such as: O-ring selection is based on chemical compatibility, application temperature, sealing pressure, lubrication requirements, quality, quantity, and cost. Some typical O-ring materials are: Nitrile (Buna-N), Silicone, Fluorocarbon (Viton), Perfluoroelastomer (Kalrez®), Fluorosilicone, Ethylene Propylene (EPM, EPDM, EP, EPR), Neoprene, and Polyurethane.

Use of silicone o-rings is for static applications where they will be put in place and not messed with since silicone is relatively soft and subject to tear easily (silicone has poor tear and abrasion resistance and should only really be considered for static rather than dynamic applications).  Therefore it's application for threaded connections is not recommended, i.e. flashlight threads. It is also more expensive than a typical synthetic rubber o-ring such as Buna-N, EPDM, or Viton, and over the production of 1000s of flashlights it is unlikely for a manufacturer to utilize a silicone o-ring in their flashlights due to relatively high cost alone.

I do not know of any of my flashlights that have silicone o-rings.  If you have a flashlight (unicorn) with silicone o-rings that's great, then don't use a silicone based grease on them. If your flashlights are like mine, then super-lube with or without PTFE (or any equivalent) is fine as a thread and o-ring lube. 

 

 

.

 

 

 max

flydiver
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max wrote:


I do not know of any of my flashlights that have silicone o-rings.  If you have a flashlight (unicorn) with silicone o-rings that’s great, then don’t use a silicone based grease on them. If your flashlights are like mine, then super-lube with or without PTFE (or any equivalent) is fine as a thread and o-ring lube. 


 


 


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I’m a diver that does their own regulator servicing. I have Buna, Viton, EDPM, and silicone O-rings. Silicone is almost exclusively in underwater camera static application, usually coming with their own specified lube.
So, I’m not to too dense about O-rings. I don’t KNOW what are in most flashlights since they never come with specs of that sort, but they ‘seem’ to be primarily silicone; semi-transparent, soft, stretchy. They are far more like the camera O-rings than anything else I work with.

Like dissolves like, though silicone seems to absorb, get fat and mushy. So, know what you lube is made of. Take your best guess on the O-ring.
For a flashlight that is not exclusively designed for diving or wet use, probably doesn’t matter a lot as it seems a number of people are getting along fine using an inappropriate lube successfully.
For my ‘dry’ lights I often simply remove the damn things as they serve no real purpose other than annoyance.

To Air is Human, to Respire….Divine.

max
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flydiver wrote:

I’m a diver that does there own regulator servicing. I have Buna, Viton, EDPM and silicone O-rings. Silicone is almost exclusively in underwater camera static application.
So, I’m not to too dense about O-rings. I don’t KNOW what are in most flashlights since they never come with specs of that sort, but they ‘seem’ to be primarily silicone; semi-transparent, soft, stretchy.

I have to humbly disagree with your statement that the o-rings on most flashlights ‘seem’ to be primarily silicone – The only o-ring on my flashlights that ‘seems’ to be semi-transparent, soft, and stretchy is the sealing o-ring under the lens. It is the only one that ‘might’ be silicone but it’s doubtful. The o-rings on the top and bottom of the battery tube are solid black, fairly firm, and not very stretchy. And yes I do know that silicone comes in a wide variety of durometers (firmness). Without lab analysis I’d guess these o-rings are Buna or EPDM.
We do have something in common – diving. Although my scuba diving was simply sport diving and not pro like you seem to be. Besides, back in those days silicone was mainly known for breast augmentation.

 

 max

Dalamar
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To be fair, all the orings I have feel a lot like my thick, uncoated nitrile gloves…that stuff is compatible with nearly everything, and it can stretch a bit.

well, I haven’t felt the viton oring in my sprayer and I’ll refrain from that unless it looks like it’s going to fail

I only like high CRI. Collection:

Fireflies NOV-MU 21 4500k E21A

Fireflies ROT66 219B SW45 D220

Fireflies E07 Copper 219B SW45k? (odd/higher lumen bin with lower r9 and higher cct?)

Fireflies E07 219B SW45k

Fireflies E07x Pro sst20 FA4 4000k (mail)

 

Varmint removal:

Convoy M21A C8 ver SST20 4000k (5a)

Convoy S2+ SST20 4000k  FB4 (3200ma)

Memes:

BLF GT94

Emisar D18 660nm SST20 (mail)

 

 

CRI test dump https://drive.google.com/drive/folders/1kcl_uOhgfpR4RSsa8F4b-UUVP9mkL6Cr...

ShyOne
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SIGShooter wrote:
My personal opinion is that it doesn’t really matter what one uses as long as they clean and re-lube regularly. I doubt many (or any) who offer an opinion have done detail scientific research into the best lubricant. I personally go with what I have handy and within reach when I’m cleaning the threads.
EDCba wrote:
But the way I see it, hydrocarbon greases are the safest bet. As flydiver said, both petroleum and silicone o-rings will be resistant to hydrocarbon/petroleum greases. BUT silicone greases will attack silicone o-rings. We’re just lucky no flashlight manufacturer uses silicone o-rings.

I think SIGShooter makes valid points. In the big scheme of things it makes little difference what brand one uses. This is not Rocket Science & no point in trying to reinvent the wheel or overthink it. Wink

Yes, Silicon lube IS NOT good for Silicon O-rings. BUT… how many Flashlights actually come with Silicon O-rings??

I have a TON of lights & I can’t name one off the top of my head, can you???

I have been using SuperLube Synthetic Grease (Multi-purpose I think) for over 20 years on my light threads & O-rings with NO problems at all.
I have never ever had an O-ring to swell.

Here is what works “for me”. YMMV

1. Get a three (3) ounce tube of SuperLube.

2. Buy a syringe & the largest gauge (boggest bore) needle you can get.

3. Remove plunger from syringe & fill with SuperLube. Carefully replace plunger.

4. I then blunt the point on the needle to avoid stabbing myself.

5. The result is a very easy way to despense the SuperLube. It can be used with or without the needle.

The needle comes in handy for tight places. Especially in fishing reels, knives, & guns.

This is what works for me & has for over 2 decades. ✅

Dalamar
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SIGShooter wrote:
My personal opinion is that it doesn’t really matter what one uses as long as they clean and re-lube regularly. I doubt many (or any) who offer an opinion have done detail scientific research into the best lubricant. I personally go with what I have handy and within reach when I’m cleaning the threads.

https://dayattherange.com/?page_id=3667

scientifically speaking, frog lube/one shot/other ptfe products are best.

but these are really overkill for a flashlight…doesn’t matter what you use as long as it’s not globbed on

I only like high CRI. Collection:

Fireflies NOV-MU 21 4500k E21A

Fireflies ROT66 219B SW45 D220

Fireflies E07 Copper 219B SW45k? (odd/higher lumen bin with lower r9 and higher cct?)

Fireflies E07 219B SW45k

Fireflies E07x Pro sst20 FA4 4000k (mail)

 

Varmint removal:

Convoy M21A C8 ver SST20 4000k (5a)

Convoy S2+ SST20 4000k  FB4 (3200ma)

Memes:

BLF GT94

Emisar D18 660nm SST20 (mail)

 

 

CRI test dump https://drive.google.com/drive/folders/1kcl_uOhgfpR4RSsa8F4b-UUVP9mkL6Cr...

flightless22
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Jerommel wrote:
For older lights without anodized threads in the tailcap, i find that candle wax does the trick best. Use the softest candle wax you can find, which will stick to the aluminium and smear rather than crumble. Unlike any other lubricant, it doesn’t dissolve the aluminium, so you don’t get that awful grey gunk you normally get, even with lumpy silicone grease. True story. Wink

Do this allow mechanical lockout? I have to try this. Shocked

NeutralFan
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These are the O-rings used in Convoy flashlights (which I have plenty of): 21*1.5mm black silicone O-ring for flashlight.

Or these from Kaidomain: 20MM X 17MM X 1.5MM WATER-TIGHT O-RING SEALSBLACK ( 5 PCS ).

I know the title or description uses “silicone”, but are the black ones actually silicone? They seem like it to me. I have some that have been slightly sliced when I got the Kaidomain hosts since they were not properly lubed.

I’d rather use my flashlight around the house than turn on the lights.

zoulas
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I work it into the grooves with my index finger. Not high tech but you get a lot of control.

CNCman
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Thank You everyone for clearing this up for me Big Smile , I have tried several lubes and now I feel comfortable using Super Lube. I just ordered :
Super Lube 51004 Synthetic Oil with PTFE, High Viscosity, 4 oz Bottle,Translucent white.
I will also get a syringe and needle to apply it with. Beer
.

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