Recycled nylon

Overview

Production: about 0.2 million tonnes (about 2% of polyamide fiber) (global recycled polyamide fiber production, 2024). [1]

Polyamide recovered through a recycling route from a specified waste stream. The original polymer and recovery method matter.

Feel and behavior

Can serve similar functions to virgin grades.

Where you find it

Swimwear, hosiery, carpets, bags and technical textiles.

Source and geography

Recycled nylon is polyamide made from waste rather than from virgin monomer. The two main textile polymers are nylon 6, polymerized from a single monomer, epsilon-caprolactam, and nylon 6,6, made from hexamethylenediamine and adipic acid. Inputs include pre-consumer waste such as polymer purge, off-specification chips and yarn and fabric waste from spinning and weaving, and post-consumer items such as discarded fishing nets and carpets. Fishing nets are predominantly nylon 6 and a major source of marine plastic pollution, which has made them a prominent feedstock for chemical recycling.

Worth knowing

• Aquafil publishes an environmental product declaration for ECONYL yarn, giving buyers producer-reported life cycle data for a specific recycled textile yarn.
• Carpet is both a major market for nylon 6 and a significant source of post-consumer nylon for chemical recycling.
• Under Textile Exchange standards, transaction certificates document each shipment of certified recycled material between certified sites.

Types, grades and fabrics

Types and grades

Recycled nylon differs by input and route. Pre-consumer material includes polymer purge, off-spec chip, yarn waste and fabric offcuts, usually mechanically reprocessed by remelting clean, single-polymer scrap; it is widely used because it is clean and consistent. Post-consumer inputs include fishing nets, carpet fluff and used garments, which need sorting and cleaning. Chemically recycled nylon 6 is depolymerized to caprolactam, purified and repolymerized, so it can match virgin quality; Aquafil's ECONYL is the best-known branded example and, according to the producer, mixes pre- and post-consumer inputs. Nylon 6,6 is harder to depolymerize commercially, so much recycled 6,6 is mechanically recycled. Mass-balance claims allocate recycled input across output rather than tracing each fiber, which should be disclosed.

Fabrics and products

Recycled nylon serves the same markets as virgin polyamide. Chemically recycled nylon 6 appears in swimwear and activewear, usually as tricot or circular knits with elastane, and in hosiery, lingerie and fine linings where uniform dyeing matters. Mechanically recycled grades suit heavier textured yarns for bags, outerwear shells, ripstop and webbing. Carpet makers use recycled nylon 6, which also closes a loop because carpet is a major nylon waste stream. Fishing-net-derived yarn is marketed in swimwear and accessories, although nets are only one of several feedstocks. Blends with elastane are common and make the next round of recycling harder.

Buying and care

How to judge quality

Performance depends on polymer and process, not on the word recycled, so judge the fabric as you would virgin nylon: hand, weave or knit density, opacity and recovery for swimwear, denier and coating for bags. Ask which polymer it is and which route: chemically recycled nylon 6 should match virgin, while mechanically recycled grades can vary in dye uptake and strength. Credible products state the recycled percentage and hold a chain-of-custody certificate, such as the Global Recycled Standard, backed by transaction certificates through each step. Be cautious with vague ocean-plastic language; ask what share is post-consumer and what waste stream it came from. Producer environmental product declarations add useful context.

Care in detail

Care is identical to virgin nylon. Wash at about 30 to 40 C with a mild detergent, separate from dark colors because nylon absorbs loose dyes, and use a mesh bag for swimwear and hosiery. Avoid chlorine bleach, which yellows nylon and degrades elastane. Rinse swimsuits in fresh water after use and dry them flat in the shade. Line dry or tumble on low, and iron only on the lowest setting (one dot, about 110 C) through a cloth if at all. Keep garments out of prolonged sunlight, which yellows and weakens polyamide. When the item wears out, check whether the brand or the producer runs a take-back program, since single-polymer nylon items are easier to recycle than blends.

Care at a glance

Follow the complete product’s care label. Blends, dyes, finishes and construction can change suitable washing, drying and storage.

Environmental and social footprint

Recycled nylon's main benefits are avoided virgin monomer production and diversion of waste. For chemical recycling of nylon 6, a 2026 parametric life cycle assessment of real processes found the solvent-free alkaline route cut global warming potential by about 80% relative to fossil caprolactam, though results varied by route and energy supply. Aquafil publishes an environmental product declaration for ECONYL yarn, which is a producer document based on its own data. Mechanical recycling uses less energy but is limited to clean streams. Recycled content does not change use-phase behavior: nylon garments still shed fibers in washing, and a 2023 study found that lowering fiber surface friction cut shedding, showing that fiber design matters. Collection of post-consumer nylon remains limited outside carpets and nets.

Tradeoffs

Origin, processing inputs, labor, product construction and useful lifetime all need specific evidence. The name alone does not establish responsible production.

A useful question to ask: What exact material, product form and documented producer stand behind this name?

Science

Recovered material, retained chemistry

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

Structure and chemistry

Recycled nylon has the same repeating amide (-CO-NH-) backbone as virgin polyamide, with hydrogen bonds between chains forming crystalline regions that give strength and a high melting point. Nylon 6 rebuilt from purified caprolactam can be chemically indistinguishable from virgin nylon 6. Mechanically recycled nylon, remelted without depolymerization, can undergo chain scission and lower molecular weight and may carry pigments, additives and contaminants from its source, which limits use in fine filament yarns. Fiber morphology is set by the spinneret, drawing and texturing, not by the waste source.

From source to yarn

Mechanical recycling cleans, shreds and remelts clean, single-polymer waste, typically pre-consumer, into pellets for extrusion. Chemical recycling of nylon 6 exploits its ability to revert to monomer. Routes studied include acidic, hydrothermal, alcoholysis and alkaline depolymerization; laboratory work has reported about 92.5 percent caprolactam yield in subcritical water at about 300 C and 10 MPa, and about 94 percent over a ruthenium on zirconia catalyst at 350 C under hydrogen. Recovered caprolactam is purified, repolymerized, melt spun, drawn and textured like virgin polymer. Enzymatic routes remain early: the best enzyme in one screen hydrolyzed only about 0.67 percent of a nylon 6 film.

Performance in use

Performance tracks polymer type and processing, not waste origin. Chemically recycled nylon 6 is intended to match virgin grades in tenacity, elongation, abrasion resistance and elastic recovery, which is why it can be used in hosiery and swimwear. Like virgin nylon it absorbs less moisture than natural fibers but more than polyester, dyes with acid dyes through its amine end groups, melts and drips in flame, and yellows and loses strength under prolonged UV. Mechanically recycled grades can show more variable dye uptake because molecular weight and end-group content vary.

How it is identified

Burn testing (indicative only; nylon melts, drips and gives a distinctive odor, so test with care) and FTIR identify polyamide, and melting behavior measured by DSC can help separate nylon 6 from nylon 6,6. None of these methods can show whether the polymer is recycled, because chemically recycled nylon is the same molecule as virgin nylon. Recycled claims therefore depend on chain-of-custody certification and on how the producer accounts for recycled input, which buyers should ask to see.

History

Timeline

1. 2011Aquafil began chemically regenerating nylon 6 waste in Ljubljana, Slovenia, under the ECONYL name, according to the producer. [2]
2. 2024A screening study characterized natural enzymes able to depolymerize nylon 6. [3]
3. 2024Recycled polyamide made up about 2% of polyamide fiber, roughly 0.2 million tonnes. [1]
4. 2026A life cycle assessment of nylon 6 remonomerization found the alkaline route cut global warming potential by about 80% relative to fossil caprolactam. [4]

Modern nylon recovery includes production waste and selected used-product streams. A take-back story is meaningful only when the actual input and downstream processing are documented.

The deeper record

Nylon 6,6 emerged from Wallace Carothers's polymer research at DuPont in the 1930s, and nylon 6 followed from caprolactam chemistry in Germany; both became major apparel and carpet polymers. Recycling began with reuse of production waste, while the chemical reversibility of nylon 6 later enabled depolymerization to monomer. Current research seeks cleaner routes: a 2026 life cycle assessment of four real-world nylon 6 remonomerization processes found the solvent-free alkaline (NaOH) route cut global warming potential by about 80 percent relative to fossil caprolactam, to about 1.46 kg CO2-eq per kg, while no route met a 1.5 C carbon budget.

Labeling and law

The generic name remains nylon in the US, and Regulation (EU) No 1007/2011 uses polyamide or nylon. A recycled claim is an environmental marketing claim; in the US the FTC's Green Guides (16 CFR Part 260) require substantiation and limit pre-consumer recycled claims to material diverted from the waste stream rather than scrap routinely reused in the same process. Textile Exchange's Recycled Claim Standard and Global Recycled Standard certify recycled input through the supply chain. Program names such as Aquafil's ECONYL are trademarks, not generic fiber names, and labels still need the generic name.

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

Frequently asked

Is ECONYL really made from fishing nets?

Fishing nets are one of its feedstocks, but Aquafil describes ECONYL as regenerated from a mix of pre- and post-consumer nylon waste, including carpet fluff, fabric scraps and industrial plastic as well as nets. The yarn's share of each stream is not usually shown on a garment, so ask the brand for details.

Is recycled nylon as strong as new nylon?

Chemically recycled nylon 6, rebuilt from purified caprolactam, can match virgin nylon in strength and recovery. Mechanically recycled nylon, simply remelted, may lose some molecular weight and vary in color, which is why it is often used in heavier fabrics. The fabric's construction matters more than the recycled label.

Does recycled nylon shed microplastics?

Yes. Once spun, recycled nylon is the same polymer as virgin nylon and sheds fibers in washing and wear. Washing on cool, short, full loads, using a filter or wash bag, and choosing tightly constructed fabrics help reduce shedding.

What certification should recycled nylon have?

Look for the Global Recycled Standard or the Recycled Claim Standard, which track recycled material through the supply chain with transaction certificates. The Global Recycled Standard also adds social, environmental and chemical requirements. A brand name alone does not certify recycled content.

Sources

• Textile Exchange: Material standards
• Environmental Science and Technology: Parametric life cycle assessment of chemical recycling of nylon-6 to caprolactam (2026)
• Waste Management: Hydrothermal processing of PET and nylon-6 mixture (2022)
• ACS Environmental Au: Depolymerization of nylon-6 over a supported ruthenium catalyst to caprolactam (2026)
• Nature Communications: Natural diversity screening and characterization of nylon-6 enzymatic depolymerization (2024)
• ChemSusChem: Directional depolymerization of nylon 6 to caprolactam with ionic liquids (2026)
• Aquafil: Environmental Product Declaration for ECONYL yarn
• Aquafil: The ECONYL Regeneration System
• European Circular Economy Stakeholder Platform: Aquafil makes ECONYL regenerated nylon yarn
• Textile Exchange: Transaction Certificate (TC), glossary
• Federal Trade Commission: Green Guides
• Textile Exchange: Materials Market Report 2025

Cite this page

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