Fuel safe RTV or castable rubber?

[tabletop]

Im trying to make a part of which common pourable RTV silicone is ideal as it needs to be cast. Only problem is it must be reasonably fuel (gasoline) resistant which all RTV's I've tried are not.
It's doesn't need to be silicone. Any rubber about 30 Shore hardness will do.
Thanks.

 

[tabletop]

Not possible to "make" fuel resistant rubber easily?

In that case can anyone tell me where to obtain sheet, or block/bar stock of fuel resistant rubbers?

Thanks.

 

[tom1953]

There may be liquid (castable) urethanes that are room temperature vulcanizable in that hardness range. Urethanes are generally good for resistance to fuels, polyester types moreso than polyether types.

A quick Google search yielded a site:

http://www.northstarpolymers.com/No...xing_Instructions/RTC_Mixing_Instructions.htm

Good luck!
tom