Polyester fiber can be natural, synthetic or a combination of the two materials. Natural fibres include silk, wool, cotton and linen. Synthetic or man-made fibres include rayon, nylon, polyester, rubber, fibreglass and spandex.
Polyester is a term often defined as “long-chain polymers chemically composed of at least 85% by weight of an ester and a dihydric alcohol and a terephthalic acid”. In other words, it means the linking of several esters within the fibers. Reaction of alcohol with carboxylic acid results in the formation of esters. Polyester allergy is considered a contact dermatitis which manifestations due to fabrics coming into contact with skin.
Polyester is a category of polymers that contain the ester functional group in their main chain. It is commonly is referred to as polyethylene terephthalate (PET). Polyesters include naturally occurring chemicals, such as in the cutin (one of two waxy polymers that are the main components of the plant cuticle, which ) of plant cuticles (covers all aerial surfaces of plants) as well as synthetics such as polybutyrate. Some are biodegradable, but most are not. Polyester is used primarily in clothing. It is also used in finishings for all kinds of surfaces.
NOTE: Allergic skin reactions to clothing/polyester is most often a result of the formaldehyde finishing resins, dyes, and other chemicals added during the manufacturing of the fabric, or due to the chemicals in the laundry detergent being use. All fibers can cause irritation, but an allergic reaction is rare.