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Manifold Seal Material

Manifold Seal Material

Manifold Seal Material

(OP)
We are reverse engineering an o-ring type seal that will primarily see intake vacuum.  Based on specific gravity & soak tests in ASTM reference fuel C we can be pretty sure they are not nitrile, hydrogenated nitrile, fluorocarbon or fluorosilicone.  Temperature resistance tests indicate they may be silicone.  Most of my experience is with fuels systems & we would never use silicone.  Parker rates silicone a 4 (unsatisfactory) for any exposure to gasoline, isooctane, h-heptane, motor oil, transmission fluid, etc.  In it's favor, silicone does have good temperature & ozone capability.  Is silicone typically used for intake applications that may see some indirect hydrocarbon exposure?

RE: Manifold Seal Material

There are special petrol resistant and Jet fuel resistant grades of Silicone rubber.

The major Silicone suppliers like Dow, GE, Wacker should be able to advise

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RE: Manifold Seal Material

(OP)
The "good" grade of silicone rubber for fuels applications is FVMQ which the OE definitely did not use based on specific gravity.  The 72 hr in ASTM reference fuel C 210% swell matches up with VMQ pretty well.  I would not consider this acceptable but apparently domestic car makers do?

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