Post by
DAEDALUS »
https://forums.nicoclub.com/daedalus-u128.html
Wed Jul 23, 2003 1:14 pm
I used CF for a year during my last year in college. Carbon fiber comes either dry or pre-preg. The dry stuff is much cheaper and requires that you apply epoxy resin to it to stabilize it, as the guy did inside his engine bay. Pre-preg (pre-impregnated) comes in rolls and has a thermoset resin already applied. It must be kept in a freezer to keep the resin from setting. This is the stuff that needs to be baked. It doesn't work quite as well on compound curves like the dry stuff does. The dry stuff is similar to fiberglass cloth for working with, but a little stiffer. For making flat trim pieces, you can use either form. Lay it down on a flat platen or mandrel and vacuum-bag it down to make it flat and even. Because the pre-preg needs to be baked too, it is usually done in a fancy oven called an autoclave. The dry stuff is likely your better bet, though it won't cure quite as nice as the pre-preg will. One problem you will have is cutting the finished product. The resin is tough and the CF very stiff. Nowhere near as bad as cutting Kevlar, though, which is damn near impossible. The best thing for cutting composites on a budget is a circular tile saw. But of course this only cuts straights. You'll be on your own for cutting rounds and fillets.