The structure of a composite is usually such, one of the components is the substrate, while the other components are substrate-bound fillers, often referred to as binders. For example, in carbon fiber-reinforced polymers, which are important for lightweight structures, polymers are substrates, while carbon fiber is fillers. In the case of structural composites, fillers are usually used as an enhanced material. Carbon fiber, for example, is an enhanced material in polymer - based composites. com believes that it can be classified according to the substrate material, which can be polymer, metal, carbon, ceramic or cement (e.g., silicate cement). They can also be classified according to the shape of the filler. Composites with particles as fillers are called particle composites. For example, concrete is a particle composite, where cement is a substrate, and sand and stone are two particles that exist at the same time. Composites that use fiber as a filler are called fiber composites.
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