Plastics are made from fossil hydrocarbons, and carbon fiber, made by pyrolysis of synthetic polyester fibers is used to reinforce plastics to form advanced, lightweight composite materials.
Plastik laves også fra fossile carbonhydrider, og carbonfibre, skabt ved pyrolyse af syntetiske polyesterfibre bruges til at forstærke plastik til at danne avancerede, lette kompositmaterialer.