Due to the relatively low processing cost, polymer based and cement-based composites are the most common types of composites. Continuous fiber reinforced polymer matrix composites are widely used in lightweight structures, such as fuselage. Polymer matrix composites containing metallic particles, such as silver particles, are used for electrical connections. Carbon black particle reinforced rubber matrix composites are used in automobile tires. Cement based composite materials in the form of concrete are widely used in civil infrastructure. Metal matrix, carbon matrix and ceramic matrix composites are rare, but they also have their own special market.
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