kerosene-proof rubber?

I got one of those dash-mount kerosene-filled aircraft compasses to put in the car; the rear seal was gone. I cut one out of a bicycle tube and it seems to leak slowly; I think that either it's not be the right kind of rubber, or there's a weeny little hole somewhere.

I know there are latex tubes and butyl tubes - this is the butyl kind, and fairly thick (for a bike tube).

If the r.c.m. advise is that the rubber's ok, I'll have another go at making one; otherwise, is there a better gasket material?

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Nitrile aka Buna-N.

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Richard J Kinch

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