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Polyester is a manufactured product made from synthesized polymers. It tends to be very resilient, quick drying, resistant to biological damage such as mold and mildew, easy to wash, and able to hold forms well. While polyester is often maligned as a textile, it has many useful applications. Polyester is, however, highly flammable, so care should be taken when wearing it. Most synthetic fabrics are subject to flammability by nature, because they are made from polymers.

Polyester is not just a textile. It is made from polyethylene terephthalate (PET), the same material used to make plastic drink bottles. Many drink bottles are recycled by being reheated and turned into polyester fibers, which in addition to being an efficient use, also helps keep polymers

Polyester may be produced in numerous forms. For example, polyester as a thermoplastic may be heated and processed into different forms, e.g., fibers, sheets, and three-dimensional shapes. While combustible at high temperatures, polyester tends to shrink away from flames and often self-extinguishes.

Polyester is the most widely used manufactured fiber in the United States. Woven polyester fabrics are used for apparel and home furnishings. These include bed sheets, bedspreads, curtains and draperies. Polyester fiberfill is also used to stuff pillows, comforters and cushion padding.

Polyester fabrics sometimes have a “less natural” feel when compared to similarly woven fabrics made from natural fibers, e.g., cotton. However, polyester fabrics may exhibit other advantages over natural fabrics, e.g., improved wrinkle resistance. As a result, polyester fibers are often spun together with natural fibers, e.g., cotton, to produce a cloth with blended properties.

Close-up of a polyester shirtPolyesters are also used to make bottles, films, tarpaulin, liquid crystal displays, holograms, filters, dielectric film for capacitors, film insulation for wire and insulating tapes.

Liquid crystalline polyesters are among the first industrially used liquid crystalline polymers. In general they have extremely good mechanical properties and are extremely heat resistant. For that reason, they can be used as an abradable seal in jet engines.

Thermosetting polyester resins are commonly used as casting materials, fiberglass laminating resins, and non-metallic auto-body fillers. In such applications, polymerization and cross-linking are initiated through an exothermic reaction involving an organic peroxide, such as methyl ethyl ketone peroxide or benzoyl peroxide.

Polyester is also widely used as a finish on high-quality wooden products like guitars, pianos and vehicle/yacht interiors (Burns Guitars, Rolls Royce and Sunseeker are examples of companies that use polyester on their products). The thixotropic properties of the sprayable form of polyester make it ideal for use on open grain timbers as it can quickly fill the grain and has a high build film thickness per coat. The cured polyester can then be sanded and polished to a high-gloss, durable finish.