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Old 09-10-2021, 04:14 PM   #1
sebastian323
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Default O-ring material - which is recomended for each application

Hello,

I am wondering which o-rings are recommended for the various applications withing the vehicle. I take it if I have the correct material , as long as the replacement o-ring is the same size as the original I am good to go. I currently have a big set of black metric nitrile o-rings and some green AC HNBR o rings.

I am wondering which material is recommend for sealing each of these:

AC r134a
engine oil
power steering fluid / ATF
coolant
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Old 09-10-2021, 05:35 PM   #2
usdmf
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Check out viton
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Old 09-10-2021, 09:04 PM   #3
KillerBMotorsport
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WRB of course

Default

HNBR for the A/C, Buna-N for the others.

Viton is terrible for cold applications as it becomes hard/inflexible, and there are no hot temps in the range that would warrant Viton's additional cost; you'd be paying for a temperature capability none of those components would ever see.

If you want to go over and above standard Buna-N, get MIL-spec Buna-N. The MIL-spec formula (and tolerances) is more stringent, giving a wider operating temp range.
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Old 09-12-2021, 12:10 PM   #4
Unabomber
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Quote:
Originally Posted by KillerBMotorsport View Post
HNBR for the A/C, Buna-N for the others.

Viton is terrible for cold applications as it becomes hard/inflexible, and there are no hot temps in the range that would warrant Viton's additional cost; you'd be paying for a temperature capability none of those components would ever see.

If you want to go over and above standard Buna-N, get MIL-spec Buna-N. The MIL-spec formula (and tolerances) is more stringent, giving a wider operating temp range.
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