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Rubber vs SIlicone O-Rings?

Poll Results: SIlicone vs rubber O-Rings?

 
  • 50% (2)
    SIlicone
  • 25% (1)
    Rubber (EPDM)
  • 25% (1)
    Doesn't matter or depends on the fitting type
4 Total Votes  
post #1 of 7
Thread Starter 
Couldn't find any info on this, but which are best to use for water cooling fittings? I'd imagine it's situational or not much difference?

I have a 50-pack of bitspower EPDM rubber O-Rings, and the standard green silicone ones as well as some Phobya red ones. My experience with silicone O-Rings has been that they're much more sensitive to over-tightening or under-tightening, while rubber can be tightened more making the fitting more secure. However, SIlicone can better fill in gaps in a worn out acrylic threaded hole since it's softer. EPDM O-Rings probably last longer though, which is why they're used in rotary seals.

Theories:
  • Silicone O-Rings better suited for acrylic or delrin/POM materials?
  • Rubber O-Rings better suited for metal to metal (like radiators) or fittings you need very tight?
  • Doesn't matter or depends on whether the fitting has proper grooves to prevent over-tightening of silicone O-Rings?
Cygni
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Cygni
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post #2 of 7
Rubber is better for normal usage as it makes a better seal than silicone.
post #3 of 7
Thread Starter 
Quote:
Originally Posted by DNMock View Post

Rubber is better for normal usage as it makes a better seal than silicone.

Hmm, thanks for the reply. I think they both can make an equally good seal with proper tightness and/or thickness. Silicone is a better gap filler though, and can be finger tightened but too tight and it squeezes out. Rubber feels a lot more solid and probably can make a better seal when tight enough plus it lasts longer, so I think I'll go with rubber O-Rings for most of my build.
Cygni
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Cygni
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post #4 of 7
It doesn't really matter. Neither is going to leak unless you screw something up, in which case both will leak.
Arcane
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Sanctum
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Arcane
(33 items)
 
Sanctum
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Fukurou
(15 items)
 
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Samsung EVO 960 Consatellation Windows 10 Pro Corsair HX 1050 
Case
Raijintek Aeneas White Window 
CPUMotherboardRAMHard Drive
Core i5-661 GA-H55-USB3 12GB DDR3 1333 WD Caviar Black AALS 640GB 
Hard DriveHard DriveOptical DriveCooling
WD Caviar Green EARS 2TB Vertex Turbo 60GB (SSD) Samsung Blu-ray, Samsung DVD Burner H50 (With push/pull nocturas) 
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Windows 10 Professional 64 LG 47inch LED LCD Saitek Eclipse Lite-touch Wireless Seasonic X750 Gold 
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post #5 of 7
Quote:
Originally Posted by s74r1 View Post

Hmm, thanks for the reply. I think they both can make an equally good seal with proper tightness and/or thickness. Silicone is a better gap filler though, and can be finger tightened but too tight and it squeezes out. Rubber feels a lot more solid and probably can make a better seal when tight enough plus it lasts longer, so I think I'll go with rubber O-Rings for most of my build.

The rubber ones will vulcanize, making basically a perfect seal while the silicone ones will not. Since the silicone ones don't vulcanize, they are more prone to being leaky, but are much easier to take off and can be reused. Also silicone ones are more resistant to extreme cold and heat.

Basically, you gotta replace the rubber ones when you disconnect the fittings after a long period of time, but you have a much larger margin for error on the machining of parts and how tight the seal must be. If you are confident in the machining on your blocks and fittings and confident in your ability to tighten them down properly, then silicone would be the way to go. Personally, I have next to no confidence in myself to not screw up so the extra idiot proofing rubber provides makes them far superior. thumb.gif
post #6 of 7
Thread Starter 
Quote:
Originally Posted by DNMock View Post

The rubber ones will vulcanize, making basically a perfect seal while the silicone ones will not. Since the silicone ones don't vulcanize, they are more prone to being leaky, but are much easier to take off and can be reused. Also silicone ones are more resistant to extreme cold and heat.

Basically, you gotta replace the rubber ones when you disconnect the fittings after a long period of time, but you have a much larger margin for error on the machining of parts and how tight the seal must be. If you are confident in the machining on your blocks and fittings and confident in your ability to tighten them down properly, then silicone would be the way to go. Personally, I have next to no confidence in myself to not screw up so the extra idiot proofing rubber provides makes them far superior. thumb.gif

Thanks for the info, I learned something new about rubber. I'll probably use silicone when doing temporary mounting and rubber for more permanent mounting. 50-pack of bitspower EPDM O-Rings is only a few bucks though. This has also convinced me to find some replacement O-Rings for my blocks I've disassembled dozens of times.
Cygni
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Samsung 950 Pro 512GB NVMe M.2 Sandisk X400 1TB mSATA SSD Custom Liquid Cooling Loop Windows 10 Pro 
MonitorKeyboardPowerCase
Acer Predator X34 34" IPS/G-Sync Curved UltraWi... Logitech G910 Orion Spark Mechanical RGB Gaming... EVGA SuperNOVA 1000 P2 w/ Noctua NF-P14s Redux Lian-Li Armorsuit PC-P50R w/ W-LM2AB-1 side pan... 
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Cygni
(18 items)
 
  
CPUMotherboardGraphicsRAM
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Hard DriveHard DriveCoolingOS
Samsung 950 Pro 512GB NVMe M.2 Sandisk X400 1TB mSATA SSD Custom Liquid Cooling Loop Windows 10 Pro 
MonitorKeyboardPowerCase
Acer Predator X34 34" IPS/G-Sync Curved UltraWi... Logitech G910 Orion Spark Mechanical RGB Gaming... EVGA SuperNOVA 1000 P2 w/ Noctua NF-P14s Redux Lian-Li Armorsuit PC-P50R w/ W-LM2AB-1 side pan... 
MouseMouse PadAudioOther
Logitech G900 Chaos Spectrum Logitech G240 Cloth Gaming Pad HDMI->Custom 7.1 Home Theater Sony Dualshock 4 Controller 
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post #7 of 7
Quote:
Originally Posted by s74r1 View Post

Thanks for the info, I learned something new about rubber. I'll probably use silicone when doing temporary mounting and rubber for more permanent mounting. 50-pack of bitspower EPDM O-Rings is only a few bucks though. This has also convinced me to find some replacement O-Rings for my blocks I've disassembled dozens of times.

If it's of any condolence, I just learned about it a few months ago while trying to look up the differences in a rubber and silicone radiator hose for my brother's jeep. Had always been told to always replace the rubber gaskets with changing parts that used them, but it wasn't until the radiator hose deal that I knew exactly why smile.gif
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