Question regarding O-ring application for water proofing a device

Q

quality1

#1
Hello,

I would like to ask experts in Rubber O-Rings if you can help me. We're new to using O ring in our products. The O-ring material is "nitro", size is 1X13 mm. We have a body and a cap, in between the body and the cap is where the O-ring sits, this is for water proofing the device. Our problem is when the cap is snapped into the body, the O-ring tends to twist which does not provide a good seal. We tried to resolve the problem with silicon lubricant which seemed to help. Can an expert determine if there's a better way of preventing twist besides using the lubricant? Our dimension is correct for the part and O-ring.

Thank you in advance for your help!
 
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#2
Re: Rubber O-Ring Inspection Standard - SAE J515?

I am not an o-ring expert, but I have some experience with them and have a lot of experience with rubber products.

First, o-rings are not ideal for this type of application. They are better suited as a static seal. If the seal is to be dynamic, it should be a straight compression, not shear. Your application will rapidly wear and stress the rubber resulting in shortened life. Do you have a retention groove for the o-ring? The retention groove allows the o-ring to seal on all 4 sides versus the top and bottom only.

Second, make sure the rubber is compatible with the silicone lubricant.

The following is a description of nitrile rubber o-rings by Da-Pro Rubber Co.: "Nitrile rubber is more resistant to oils and acids compared to natural rubber but is not as strong or flexible. Like natural rubber it can be attacked by ozone, aromatic hydrocarbons, ketones, esters and aldehydes but is generally resistant to aliphatic hydrocarbons."
 
S

Skydog

#3
Hello,
Sorry for not replaying before. Could you please share a picture?
I work for major O-ring manufacturer.
Nitrile works for water with no problem. But also it does EPDM. The advantage of EPDM is that is resistant to weather and ozone (NBR can be made resistant, but is not inherent to the material).
To avoid the twist, one solution would be using X-Rings, instead of o-rings... But the cost generaly is higher.
We have several options for materials (many of them used with water, as NSF approved material), some with internal lubricant, some with external lubricant added.
Please send me the the pictura or sketch of the assembly, along with some information about the application (temperature range, liquids expected to have contact, etc), and I may give a better indication.
Sincerely yours,
Daniel
 
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