polyester

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Synthetic resin formed by the condensation of polyhydric alcohols (alcohols containing more than one hydroxyl group) with dibasic acids (acids containing two replaceable hydrogen atoms). Polyesters are thermosetting plastics, used for constructional plastics and, with glass fibre added as reinforcement, they are used in car bodies and boat hulls. Polyester is also a major synthetic fibre used for knitting or weaving fabrics which are strong but lightweight, and resist creasing but can be heat-set into pleats. Polyester is often mixed with other fibres and can be found in a wide range of different textiles.

The number of stripes changed frequently until around 1800. Red, white, and blue became the colours of liberty and an inspiration for other revolutionary flags around the world. Effective date: 19 February 1937. >>