Intake plenum

I'm thinking about making a carb. heat plenum for my plane out of
fiberglass ( epoxy.) I had done it once for my Quickie many years
ago because that's what what the plans said to do. But that was a
very small plenum. Due to space constraints, it would be very easy to
make it out of fiberglass for my new project ( 120 h.p.) but I'm
wondering if the carb heat would be too hot for the fiberglass. I
will make it out of aluminum if I have to, but it would be harder to
do. Do you think the fiberglass would work? Thanks

Neal