Hardly any group of materials has more potential in the eyes of engineers and scientists than fiber-reinforced plastics; these are plastics that in most cases amalgamate two different materials whose combined properties achieve the required specifications more efficiently. The principle of fiber reinforcement has been known since antiquity. It was not until early in the 20th century, however, that engineers began to study these hybrid materials, in the framework of the new discipline of macromolecular chemistry, and to define them as structural materials. The development, production, and use of these materials marked a new chapter in materials technology design and was instrumental in characterizing new load parameters for engineering products. This process is ongoing.