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Material Creep vs. Compression Set

Material Creep vs. Compression Set

Material Creep vs. Compression Set

(OP)
I have an application where I am tryin to seal (static) internal combustion exhaust and I am currently using a 75 durometer FKM component similiar in shape to a compression seal used in plumbing applications.  I am worried about creep in this application.  My vendor has recommended moving to a 90 durometer FKM, which has a slightly higher compression set than the 75 durometer material.

My questions
- is there a correlation between creep and compression set?
- should I be concerned about creep?

RE: Material Creep vs. Compression Set

One thing I recently learned about rubbers is that the modulus in a case like this is probably more important than the durometer.  The two usually follow each other, but that is not always the case.  O-rings (I'm assuming used here) usually follow durometer ratings, but a rubber manufacturer can give you the current modulus and possibly vary that to help you avoid a problem.

One other thing: anywhere you have compressed rubber, you have a permanent compression set.  You can minimize it with certain materials (like black EPDM vs. Buna N), but it will probably need replaced eventually.

RE: Material Creep vs. Compression Set

Sir,

I don't  think same with your vendor,More hardness of o-ring that means less elasticity you have.

Bye.

pairoch@ascthai.com

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