Composites are products formed by combining two or more discrete physical phases, usually a solid matrix and a fibrous reinforcing material. The reinforcing component often consists of or is made up from high-tenacity fibres as the strain-resistant structure, and is surrounded by a polymer matrix that acts as a rigidising adhesive holding the fibrous component(s) in place.

Such composites are used for high-performance parts having low specific weight. One objective is to replace metallic materials. Fibres with high tenacity can be used simultaneously with low-stretch, high-modular filament yarns. These include glass fibres, carbon, and aramide. The strength of the composite is also determined by the position of the yarns and the angle at which they are inserted into the matrix.

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