Polyester

Overview

Production: about 78 million tonnes (about 59% of all fiber) (global polyester fiber production, virgin and recycled, 2024). [1]

For most apparel, polyethylene terephthalate (PET), formed into continuous filament or staple fiber.

Feel and behavior

Versatile, low in moisture absorption and often quick to dry.

Where you find it

Sportswear, fleece, linings, home textiles and blends.

Source and geography

Textile polyester is overwhelmingly poly(ethylene terephthalate), PET: a 2025 review puts PET at roughly 95% of polyester fiber, with smaller volumes of PBT and PTT. Its monomers are petrochemical, terephthalic acid (or its dimethyl ester, DMT) and ethylene glycol. Polyester is the largest fiber by volume: of a record 116 million tonnes of fiber produced in 2022, it made up about 54%, against about 22% for cotton. Bottles use the same PET chemistry, which ties the fiber to packaging supply chains and to bottle recycling.

Worth knowing

• Textile Exchange reports that about 98% of recycled polyester in 2024 still came from plastic bottles, and that recycled textiles made up under 1% of global fiber supply.
• A 2022 laboratory study found that vented tumble dryers emit microfibers to the air in amounts comparable to those released down the drain during washing.
• A factory study published in 2023 found that wet processing, mostly dyeing, released up to 25 times more microfibers than home laundering.

Types, grades and fabrics

Types and grades

Polyester is sold in two basic forms. Filament yarn is continuous; it leaves the spinning line as partially oriented yarn (POY), which is either fully drawn into flat, glossy fully drawn yarn (FDY) or false-twist textured into draw-textured yarn (DTY), the crimped, bulky workhorse of knits, fleece and stretch wovens. Air-textured yarn adds loops for a spun-like look. Staple fiber is cut into short lengths and spun, usually with cotton or viscose, into spun polyester, which feels more like cotton but pills more. Microfiber means filaments finer than about 1 denier (roughly 1 dtex), against about 3 to 5 denier for conventional filament. Other trade forms include hollow fiberfill, cationic-dyeable polyester, and recycled polyester (rPET), which in 2024 was about 12% of polyester output and was still made about 98% from bottles, according to Textile Exchange.

Fabrics and products

Filament polyester dominates silk-look wovens: satin (a float weave for sheen), chiffon and georgette (sheer plain weaves from high-twist crepe yarns, georgette being heavier and grainier), taffeta (a crisp, tight plain weave for linings and formalwear) and pongee linings. Ripstop polyester adds heavier yarns in a grid to stop tears spreading, and is used for tents, flags and light jackets. Knits include jersey, mesh and interlock for sportswear, and fleece, a knit brushed and napped on one or both sides for warmth. Microfiber is made into peach-skin shirting, microsuede, cleaning cloths and sheets. Spun polyester blended with cotton gives polycotton shirting, workwear and bedding, and polyester fiberfill stuffs pillows and duvets.

Buying and care

How to judge quality

Start with the construction. A tight weave or dense knit with smooth filament yarn resists snagging and pilling better than a loose knit of spun staple. Fleece should feel even and springy, with no bald patches after brushing, and seams should lie flat without puckering. Rub a hidden area: fuzz balls on a new garment predict heavy pilling. Hold sheers up to light to judge evenness. Satin and chiffon labeled 'silky' are often polyester, so read the fiber line rather than the description. A recycled claim should name a percentage and be backed by a chain-of-custody certificate such as the Global Recycled Standard, because no routine test separates recycled from virgin PET. Very low prices usually reflect thin, loose fabric rather than the fiber itself.

Care in detail

Most polyester washes well at 30 to 40 C with ordinary detergent; cooler, fuller, shorter cycles reduce both energy and fiber shedding, and a mesh bag or an in-line filter captures some fibers. Wash fleece and performance knits inside out and skip fabric softener, which can coat surfaces and reduce wicking. Tumble dry low or line dry; condenser and heat-pump dryers retain more fibers than vented dryers. Iron on a low to medium setting (the one- or two-dot symbol under ISO 3758, about 110 to 150 C), using a press cloth on satins to avoid shine. Treat oily stains promptly with a little dish detergent, since polyester binds oils. Remove pills with a fabric shaver rather than pulling. Polyester resists moths and mildew, but heat from radiators or dryers can distort it permanently.

Care at a glance

Follow the label, avoid unnecessary heat and wash only as needed. Reduce avoidable abrasion.

Environmental and social footprint

Polyester is a fossil-based plastic, and its best-studied problem after production energy is microfiber release. In a 2019 full-scale washing study, De Falco and colleagues measured about 124 to 308 mg of microfibers per kg of synthetic clothing washed, roughly 640,000 to 1,500,000 fibers per kg. Carney Almroth and colleagues (2018) found polyester fleece shed far more than other polyester knits, averaging 7,360 fibers per square meter per liter in one wash against 87. A 2022 study of vented tumble dryers found airborne releases comparable to those sent down the drain. Recycled content does not solve shedding: a 2026 Swedish study found fabrics whose recycled polyester had been mechanically reprocessed twice or three times shed about 4.3 and 6.2 times more than virgin controls. Tighter constructions and higher-twist yarns shed less in the same studies.

Tradeoffs

Virgin fossil feedstock, energy use and microfiber shedding are key considerations. Recycled content does not eliminate shedding.

A useful question to ask: What is the feedstock, recycled percentage and evidence for any recycling claim?

Science

Data sheet

Engineered organic polymer

Polymer chemistry and fiber-forming conditions determine the starting material.

Structure and chemistry

PET is a linear condensation polymer in which ester linkages join ethylene glycol units to para-substituted benzene rings. The rigid aromatic rings restrict chain mobility, giving a glass transition around 70 to 80 C and a crystalline melting range of roughly 250 to 265 C. As spun, the filament is a largely amorphous, partly oriented solid; drawing aligns the chains and lets oriented crystallites form, which supplies most of the fiber's tenacity. Textile-grade PET has a lower molar mass than bottle grade, with an intrinsic viscosity of about 0.57 to 0.62 dL/g against 0.72 to 0.85 for bottles. Homopolymer also carries about 1 to 1.5 mol% diethylene glycol units from a side reaction, and the spinneret sets the cross-section: round, trilobal, hollow or channeled.

From source to yarn

PET is made in two stages. Terephthalic acid is esterified with ethylene glycol to a precondensate, mainly bis(2-hydroxyethyl) terephthalate (BHET), which is polycondensed under vacuum at roughly 230 to 290 C with a catalyst, most often antimony trioxide; solid-state polycondensation can raise molar mass further. Chip or melt is dried to very low moisture, about 50 ppm, because water hydrolyzes ester bonds at melt temperature, then melt spun, quenched and drawn. Filament is often wound as partially oriented yarn and draw-textured, while staple is crimped and cut for blending with cotton or wool. Fabrics are heat set, typically at about 190 to 220 C in dry air or 130 to 140 C in steam, to fix their dimensions.

Performance in use

PET absorbs very little water, so it keeps its strength wet, dries quickly and resists creasing once heat set, but liquid sweat must be moved along fiber surfaces by profile or finish rather than absorbed. It is thermoplastic: it softens and melts instead of charring, which is why hot irons glaze it. Lacking ionic dye sites, standard PET is dyed with small nonionic disperse dyes, typically at about 130 C under pressure; cationic-dyeable copolymers add sulfonate groups for basic dyes. Staple polyester fabrics are prone to pilling. Laundering releases fiber fragments: machine-washing tests on synthetic jackets recovered up to about 2 g per garment, with top-loading machines releasing roughly seven times more than front-loaders.

How it is identified

Burn tests are indicative only and need fire precautions. PET shrinks from the flame, melts and burns with sooty smoke, leaving a hard, dark bead. Under the microscope it is smooth and featureless, and its cross-section reveals the spinneret profile; delustered grades contain titanium dioxide particles added for opacity. FTIR identifies the aromatic ester, and differential scanning calorimetry separates PET from PTT or PBT by melting point. No routine test distinguishes recycled from virgin PET, and polyester is often sold with silk-look, linen-look or wool-look finishes.

History

Timeline

1. 1941A 2020 review dates the first PET fiber, Terylene, to 1941, developed in Britain three years after nylon was launched. [3]
2. 1951The first commercially marketed polyester fiber reached consumers in men's suits blending DuPont's fiber with worsted wool. [4]
3. 1953Demand for DuPont's polyester, developed in a pilot plant at Seaford, Delaware, led to construction of a plant at Kinston, North Carolina. [4]
4. 2016A laundering study quantified the mass of microfibers released by machine-washing new and aged synthetic garments. [5]
5. 2024Polyester made up about 59% of global fiber output, roughly 78 million tonnes. [1]

Polyester expanded with twentieth-century synthetic polymer technology and mass textile production. It became important in apparel and home textiles, then in fleece and performance fabrics. The current story includes both virgin feedstocks and distinct recycling routes.

The deeper record

Polyester fiber is younger than nylon. A 2020 review dates the first PET fiber, Terylene, to 1941, three years after DuPont launched nylon, and PET went on to dominate melt spinning because it is economical to produce and unusually easy to modify physically and chemically. Its scale has brought newer concerns. Antimony trioxide, the catalyst in an estimated 80 to 85% of virgin PET, has been measured in polyester fabrics at about 125 to 470 micrograms per gram, and studies since 2016 have linked the laundering of synthetic garments to microplastic fibers in wastewater. Recycling still relies mostly on bottles; less than 0.1% of polyester textiles are recycled into new textiles.

Labeling and law

In the United States, 16 CFR 303.7 defines polyester as a manufactured fiber whose fiber-forming substance is at least 85% by weight an ester of a substituted aromatic carboxylic acid, including terephthalate units, and the Textile Fiber Products Identification Act requires that generic name with percentages by weight. PTT may alternatively be labeled triexta. The EU uses polyester under Regulation (EU) No 1007/2011. Trademarks such as COOLMAX or Sorona may appear only alongside the generic name. Recycled-content claims are separate environmental claims, commonly supported by chain-of-custody standards such as the Global Recycled Standard or Recycled Claim Standard.

This describes what rules and standards cover. It is not legal advice; jurisdiction, product form and current rule text control.

Frequently asked

Is polyester the same as microfiber?

Not exactly. Microfiber describes fineness, filaments finer than about 1 denier, and can be polyester, nylon or a blend of both. Most microfiber cloths and peach-skin fabrics are polyester or polyester with nylon. Ordinary polyester filament is several times coarser. The fiber content line tells you the polymer; the word microfiber tells you only about filament size.

Is recycled polyester better than virgin polyester?

It reuses existing plastic, mostly bottles, instead of new petrochemicals, but it behaves the same in the garment and still sheds microfibers. Some studies found recycled polyester fabrics shed more, especially after repeated mechanical recycling. Its benefit depends on the documented feedstock and energy used. Look for a percentage and a chain-of-custody certificate rather than a general green claim.

Why does my polyester sweater pill so much?

Pills form when loose fiber ends on spun or brushed yarns tangle under friction. Because polyester fibers are strong, the tangled balls stay anchored instead of breaking away as they do on weaker fibers. Tighter knits, filament yarns and higher-twist yarns pill less. Wash inside out on gentle cycles and use a fabric shaver to remove pills.

Can you iron polyester?

Yes, at a low to medium setting, usually one or two dots on the care label (about 110 to 150 C). Too much heat glazes the surface or melts it, because polyester is thermoplastic. Use steam and a press cloth, especially on satin or dark colors, and test an inside seam first.

Sources

• Textile Exchange: Materials Market Report 2025
• Textile Exchange: Material standards
• Molecules: Impact of chemicals and processing treatments on thermo-mechanical recycling of polyester textiles (2025)
• Polymers: Advancing textile waste recycling, challenges and opportunities across polymer and non-polymer fiber types (2025)
• Materials: Melt-spun fibers for textile applications (2020)
• Environmental Science and Technology: Microfiber masses recovered from conventional machine washing of new or aged garments (2016)
• eCFR: 16 CFR 303.7, Generic names and definitions for manufactured fibers
• Scientific Reports: The contribution of washing processes of synthetic clothes to microplastic pollution (De Falco et al., 2019)
• Environmental Science and Pollution Research: Quantifying shedding of synthetic fibers from textiles (Carney Almroth et al., 2018)
• Environmental Science and Technology: Mechanically recycled textiles, a source of microplastic fiber emissions (Persson et al., 2026)
• PLOS One: Fabric conditioning products, lint filter pore size and airborne microfiber pollution from tumble drying (Lant et al., 2022)
• MFA Boston CAMEO: Polyester fiber
• Hagley Museum and Library: This week marks a milestone in the history of textiles

Cite this page

Chaos. (2026). Polyester. In Fibers of Earth: An independent textile atlas. https://www.hendrickresearch.com/fibers/materials/polyester/