Recycled polyester

Overview

Production: about 9.3 million tonnes (about 12% of polyester fiber) (global recycled polyester fiber production, mostly from PET bottles, 2024). [1]

PET reprocessed from sources such as bottles, industrial waste or textiles.

Feel and behavior

Can provide similar textile functions to virgin polyester; quality depends on feedstock and processing.

Where you find it

Fleece, sportswear, linings, bags and home textiles.

Source and geography

Recycled polyester is PET made from waste rather than from virgin terephthalic acid and ethylene glycol. According to a 2025 review, about 12.5 to 15% of polyester fiber is now made from recycled material, and roughly 98% of that comes from plastic bottles, which are relatively clean, single-polymer and chemically close to fiber-grade PET. Textile waste is a minor input: less than 0.1% of polyester textiles are recycled into new textiles in a closed loop. Other feedstocks include fiber and yarn production waste and, in branded programs, plastic recovered from coasts and the sea.

Worth knowing

• A 2023 life cycle study found that bottle-to-fiber recycling scored well on circularity when fiber was made from 100% recycled PET, yet still recommended bottle-to-bottle recycling to keep the material at its highest value.
• The Global Recycled Standard can be used business-to-business from 20% recycled content, but a GRS product label requires at least 50%.

Types, grades and fabrics

Types and grades

Recycled polyester is classed by feedstock and route. Bottle-derived rPET, made from washed post-consumer bottle flake, dominates supply. Pre-consumer textile rPET comes from fiber, yarn and fabric production waste, and post-consumer textile rPET, from worn garments, is still a small niche. Mechanically recycled rPET is remelted and can carry impurities, while chemically recycled rPET is rebuilt from depolymerized monomers and can match virgin polymer. Product forms include filament yarn, flat or textured, for fleece and sportswear, staple fiber for blends, and hollow staple for fiberfill. Branded programs include Unifi's REPREVE and SEAQUAL yarn, which its initiative describes as including plastic recovered from the sea. Certified claims follow the RCS (from 5% recycled input) or the GRS (from 20%, with product labels from 50%).

Fabrics and products

Recycled polyester appears wherever virgin polyester does. Knitted fleece, jersey and mesh are used in sportswear, base layers and sweatshirts; woven taffeta, ripstop and twill serve as jacket shells, linings, backpacks and luggage; and microfiber knits are used for towels and cleaning cloths. Hollow staple fiberfill insulates jackets, pillows and duvets. It is blended with cotton in T-shirts and with wool or viscose in suiting and knitwear, and used in carpets, upholstery and curtains. Performance finishes such as water repellents and wicking treatments are applied just as to virgin polyester.

Buying and care

How to judge quality

Recycled polyester should perform like virgin polyester of the same construction, so judge weight, weave or knit density and finish rather than the recycled label alone. Staple-fiber fabrics pill more than filament fabrics. Look for exact claims: '100% recycled polyester' differs from 'made with recycled materials', which may mean a small share, and the FTC Green Guides expect qualified claims when only part of a product is recycled. Ask whether feedstock was bottles or textiles, and for a GRS or RCS transaction certificate; hangtags from branded programs may be backed by tracer testing. No routine test can distinguish recycled from virgin PET in a finished garment.

Care in detail

Wash recycled polyester as you would virgin polyester: 30 to 40 C, inside out, on a regular or synthetic cycle. Polyester attracts oily soils, so pretreat collar and underarm grease with detergent before washing. Fabric softener can coat wicking and water-repellent finishes, so skip it on performance wear. Tumble dry on low or line dry; high heat can set wrinkles, damage elastane and melt prints. If ironing is needed, use the lowest setting, about 110 C (one dot), since polyester can glaze or melt. To reduce microfiber release, wash less often, in cooler water, and consider a filter or a fiber-catching wash bag, whose effectiveness varies.

Care at a glance

Follow the label, reduce avoidable heat and friction, and repair rather than replace where practical.

Environmental and social footprint

Life cycle studies generally credit recycled polyester with lower emissions and fossil resource use than virgin PET. A 2023 Thai assessment by Chairat and Gheewala in Environmental Research reported that producing bottle-grade resin and polyester fiber from waste bottles could cut greenhouse gas emissions by about 60% and fossil resource scarcity by about 85%, though the size of the benefit depended on the allocation method; the authors still favored bottle-to-bottle recycling to keep material at its highest value. Diverting bottles into clothing moves plastic into products that are rarely recycled again. Recycled content does not change shedding: in laundering tests polyester microfibers persisted in aerobic water while cotton and rayon fragments degraded.

Tradeoffs

Bottle-to-fiber recycling is not the same as textile-to-textile recycling. Microfiber shedding remains relevant.

A useful question to ask: What waste stream supplied the PET, and is the recycled fraction independently verified?

Science

Data sheet

Recovered material, retained chemistry

Recycled describes the feedstock history, not a new polymer family.

Structure and chemistry

Recycled PET is the same polymer as virgin PET, ester links joining terephthalate and ethylene glycol units, so the differences lie in chain length and impurities. Bottle-grade PET has a higher intrinsic viscosity (about 0.72 to 0.85 dL/g) than fiber grade (about 0.57 to 0.62), so bottle flake can lose some chain length in reprocessing and still meet fiber requirements. Mechanically recycled PET can carry traces of other polymers such as PVC and polyolefins, label paper, oligomers and additives; bisphenol A has been reported at up to about 10 ppm in some recycled PET. Textile-derived PET adds dyes, spin finishes, flame retardants and fluorinated repellents. Chemically recycled PET, rebuilt from purified monomers, can match virgin polymer.

From source to yarn

In mechanical (thermo-mechanical) recycling, bottles are sorted, washed and ground to flake, dried to very low moisture because hydrolysis at melt temperature shortens chains, then melted, filtered and extruded as chip or spun directly into filament or staple. Virgin PET is often added to restore viscosity and dilute contaminants. Chemical routes break the ester bonds: glycolysis with excess ethylene glycol at about 180 to 240 C yields BHET; methanolysis gives dimethyl terephthalate; alkaline hydrolysis gives terephthalate salts that must be decolorized before reuse. Enzymatic routes use engineered PET hydrolases. Textile feedstocks first need sorting, removal of trims and, for blends, separation of cotton or elastane.

Performance in use

Recycled polyester behaves much like virgin PET in moisture, strength and heat response, but quality varies with feedstock, and each melt cycle risks chain scission, discoloration and weaker, less uniform yarn, especially from textile waste loaded with finishes and dyes. Some processing chemicals slow hydrolytic breakdown, while acids, bases and certain phosphorus flame retardants can accelerate degradation or cause chain branching that prevents melt spinning. Recycled content does not eliminate fiber shedding, since laundering still releases persistent PET fragments. Dyeing, pilling and care are otherwise the same as for virgin polyester.

How it is identified

Burn tests are indicative only and identify polyester, not its origin: it melts, shrinks from the flame and leaves a hard bead. FTIR, differential scanning calorimetry and microscopy likewise show ordinary PET. No routine laboratory method separates recycled from virgin PET, so claims rely on chain-of-custody records, transaction certificates and, in some branded programs, tracer additives detected in finished goods. Trace contaminants such as bisphenol A or other polymers may hint at a bottle-derived origin but are not proof.

History

Timeline

1. 2007Unifi launched REPREVE, a recycled polyester made from bottles and yarn waste. [3]
2. 2020Researchers including the company Carbios reported an engineered enzyme that depolymerized at least 90% of PET in 10 hours. [4]
3. 2023Recycled polyester reached about 8.9 million tonnes, about 12.5% of polyester fiber. [1]
4. 2024Recycled polyester rose to about 9.3 million tonnes, while its share of polyester fell to about 12%; about 98% still came from bottles. [1]

Polyester recycling expanded through recovery of PET products, particularly bottles. Textile-to-textile recovery is a separate challenge. Modern recycled-content claims need to distinguish the input waste stream and the recycled share.

The deeper record

Recycled polyester grew out of the collection and flake-washing infrastructure built for PET bottles. Branded yarns such as Unifi's REPREVE, launched in 2007, scaled bottle-to-fiber supply, and by the mid-2020s recycled PET made up roughly an eighth of polyester fiber. Because this route diverts bottles rather than closing the clothing loop, attention has turned to textile-to-textile recycling. In 2020 a team including the French company Carbios reported an engineered PET hydrolase that depolymerized at least 90% of PET in 10 hours and showed that bottles could be remade from the recovered monomers; enzymatic and alkaline routes are now being tested on polyester-cotton and polyester-elastane waste.

Labeling and law

The generic name stays polyester under 16 CFR 303.7 and Regulation (EU) No 1007/2011; recycled is an additional claim, not a fiber name. In the US such claims fall under the FTC Green Guides (16 CFR Part 260), which expect recycled-content claims to be substantiated and qualified where only part of the product is recycled, and treat pre-consumer claims as covering only material diverted from the waste stream. Textile Exchange's Global Recycled Standard and Recycled Claim Standard certify recycled content through the supply chain. Bottle-based fiber should not be presented as textile-to-textile recycling.

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

Frequently asked

Is recycled polyester made from old clothes?

Usually not. Most recycled polyester fiber is made from plastic bottles, which are cleaner and easier to reprocess than garments with dyes, finishes and blended fibers. Textile-to-textile recycling exists but remains a very small share of supply.

Is recycled polyester better for the environment?

It usually has lower greenhouse gas emissions and fossil resource use than virgin polyester in life cycle studies. It does not stop microfiber shedding or make garments easier to recycle, and turning bottles into clothing takes them out of the bottle-to-bottle loop.

Does recycled polyester shed microplastics?

Yes. The polymer is the same PET, so recycled polyester sheds fibers in washing just as virgin polyester does, and those fragments persist in water. Cooler water, fewer washes and washing-machine filters can reduce but not eliminate release.

How can I tell if a garment is really recycled polyester?

You cannot tell by look, feel or routine lab test. Rely on documentation: a GRS or RCS certificate covering the product, a transaction certificate from the supplier, or a branded fiber program that uses tracer testing.

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)
• Nature: An engineered PET depolymerase to break down and recycle plastic bottles (2020)
• Molecules: Comparison of catalyst effectiveness in different chemical depolymerization methods of poly(ethylene terephthalate) (2023)
• Federal Trade Commission: Green Guides
• Environmental Research: Life cycle assessment and circularity of polyethylene terephthalate bottles via closed and open loop recycling (Chairat and Gheewala, 2023)
• Marine Pollution Bulletin: Microfibers generated from the laundering of cotton, rayon and polyester based fabrics and their aquatic biodegradation (2019)
• Textile Exchange: Recycled Claim Standard (RCS) and Global Recycled Standard (GRS)
• SEAQUAL INITIATIVE: SEAQUAL polyester yarn
• Sourcing Journal (WWD): From bottles to blouses, inside Unifi's North Carolina Repreve factory
• Unifi: REPREVE (producer source)

Cite this page

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