01How recycled polyester is made
Most recycled polyester starts as clear PET bottles. They are collected, sorted, washed, stripped of caps and labels, and chopped into flakes. The flakes are dried, melted and either pelletized into chips or fed straight into extrusion, where the molten polymer is pushed through spinnerets to make filament. That filament is textured, or cut into staple fiber and spun, just like virgin polyester.
That is mechanical recycling, and it is the bulk of what mills sell. The catch is that every melt shortens the polymer chains a little and any contamination ends up in the yarn, so mills blend in better feedstock or control it tightly for fine yarns.
Chemical recycling breaks PET back down to its building blocks (monomers or oligomers), cleans them and rebuilds the polymer. The result is close to virgin quality and can take dyed or mixed textile waste that mechanical recycling cannot. It costs more and capacity is still limited, so expect higher prices and longer lead times when you ask for it.
02Bottles vs textile waste
Bottle-based rPET is the easy, cheap version: clear bottles are a clean, consistent feedstock. Critics point out that it takes bottles out of the bottle-to-bottle loop and turns them into clothing that is rarely recycled again. That is a fair point, and it is worth knowing before you write marketing copy.
Textile-to-textile recycled polyester uses cutting waste (pre-consumer) or worn garments (post-consumer). It is the better story but harder to buy: blends with cotton or spandex, dyes and finishes all complicate recycling. Mills that offer it usually quote it as a separate, higher-priced line with its own minimums.
| Bottle rPET | Textile-to-textile rPET | |
|---|---|---|
| Feedstock | Post-consumer PET bottles | Factory offcuts or used garments |
| Availability | Wide, most mills stock it | Limited, fewer suppliers |
| Price | Small premium over virgin | Higher premium |
| Typical process | Mechanical | Often chemical |
| Marketing angle | Made from plastic bottles | Made from old clothing or textile waste |
03GRS, RCS and the traceability problem
You cannot reliably tell recycled polyester from virgin polyester by testing the finished fabric. They are the same polymer. Some suppliers add tracer or marker technology to their fiber, but for most fabric the proof is a chain of custody: every company that handles the material is certified, and each shipment comes with a transaction certificate (TC) stating the recycled content.
- Global Recycled Standard (GRS): from Textile Exchange. Verifies recycled content and also covers chemical use, environmental and social criteria at each certified site. A product generally needs at least 20% recycled content to be certified, and at least 50% to carry the GRS logo.
- Recycled Claim Standard (RCS): also Textile Exchange. Verifies recycled content and chain of custody only, with no environmental or social criteria. RCS 100 is for 95% or more recycled content; RCS Blended for lower percentages.
- Transaction certificates: the actual proof for your order. Ask for them per shipment, issued to your company or your factory, not just a copy of the mill’s scope certificate.
The weak spot is the cut-and-sew factory. If your garment maker is not certified, the chain breaks at them and you technically cannot make a certified claim on the finished product, even if the fabric was certified.
04Pros and cons
- Performs almost the same as virgin polyester: strong, quick drying, holds color
- Widely available from most synthetic fabric mills, often in stock colors
- Certified versions give you a defensible sustainability claim
- Price premium over virgin is usually small for bottle-based yarn
- Works in nearly every polyester construction, from mesh to fleece
- You cannot prove recycled content by testing the fabric; you rely on certificates
- Bottle-based rPET is criticized as downcycling, so overclaiming is a real risk
- Still sheds microfibers in the wash, like any polyester
- Mechanically recycled yarn can vary more in shade and quality lot to lot
- Textile-to-textile and chemically recycled options cost more and have higher MOQs
05Typical uses and price
- Activewear: leggings, sports bras, running tops (with spandex)
- Fleece jackets and hoodie linings
- Outerwear shells, puffer fabric and insulation fill
- Swimwear and boardshorts
- Bags, backpacks and webbing
- Labels, linings and packaging bags
Price tier: Budget to mid. Bottle-based rPET usually carries a modest premium over virgin polyester; certified textile-to-textile and chemically recycled yarns cost noticeably more. The premium moves with oil and recycled flake prices, so get it requoted on each order.
06How to spec it with a factory
The recycled claim lives or dies on paperwork, so write it into the tech pack and the purchase order, not just the conversation.
| No. | Field | What to write |
|---|---|---|
| 01 | Fabric composition | Exact percentages, e.g. 88% recycled polyester, 12% spandex; say which components are recycled |
| 02 | Recycled source | Post-consumer bottle, pre-consumer textile or post-consumer textile |
| 03 | Certification | GRS or RCS required, with transaction certificates per shipment |
| 04 | Yarn | Filament or spun, denier and filament count (e.g. 75D/72F) or yarn count |
| 05 | Construction | Jersey, interlock, mesh, fleece, taffeta, ripstop etc. |
| 06 | Weight | GSM after finishing, with a tolerance such as plus or minus 5% |
| 07 | Finishes | Wicking, anti-odor, DWR or brushing; name any finish chemistry restrictions |
| 08 | Color | Pantone or lab dip reference; approve lab dips on the recycled base, not a virgin stand-in |
Certifications and marks
- Global Recycled Standard (GRS)
- Recycled content plus chemical, environmental and social requirements. Needed at each stage for a certified product claim.
- Recycled Claim Standard (RCS)
- Recycled content and chain of custody only. Lighter and cheaper to hold than GRS.
- OEKO-TEX Standard 100
- Tests the finished fabric for harmful substances. Separate from the recycled claim.
- bluesign
- Covers chemical and environmental management at the mill. Common with performance fabric suppliers.
From the factory floor
- Ask for the mill’s scope certificate and check that your exact fabric type is on it before you sample.
- Make transaction certificates a condition of payment for bulk; chasing them after shipment rarely works.
- Watch for silent substitution to virgin poly when recycled yarn runs short; the fabric will look identical.
- Lab dip on the actual recycled base. Recycled yarn can take dye slightly differently from virgin.
- Keep marketing claims to what you can document, e.g. "made with 100% recycled polyester (GRS certified)".
07Recycled polyester vs virgin polyester
| Recycled polyester | Virgin polyester | |
|---|---|---|
| Feedstock | Used PET bottles or textile waste | Petroleum-derived chemicals |
| Performance | Nearly identical | Baseline |
| Consistency | Good; slightly more lot variation in mechanical rPET | Very consistent |
| Price | Small to moderate premium | Lowest |
| Proof of claim | GRS or RCS paperwork | Not applicable |
| Microfiber shedding | Yes | Yes |
08Recycled polyester vs recycled nylon
Recycled nylon is softer, stretchier and more abrasion resistant, which is why it shows up in premium leggings and swimwear. It usually costs more and comes from fewer sources (fishing nets, carpet, industrial waste). Recycled polyester is cheaper, dries faster and holds sublimation prints, which nylon does not.
09Recycled polyester vs cotton
Cotton absorbs moisture and feels natural; recycled polyester wicks and dries fast. For a training top, recycled poly wins. For a casual tee or a fleece hoodie, many brands use a cotton and recycled poly blend for softness plus shape retention.
10FAQ
Q01Is recycled polyester better than regular polyester?
It uses waste instead of new petroleum feedstock, which generally lowers its footprint, and it performs about the same. It still sheds microfibers and is rarely recycled again after use, so it is better, not perfect.
Q02What is recycled polyester made from?
Mostly used PET drink bottles. A smaller and growing share comes from factory cutting waste and old garments, sometimes through chemical recycling.
Q03How do you know if polyester is really recycled?
You generally cannot tell by looking or by a standard lab test. Ask for GRS or RCS certification and a transaction certificate for your specific order.
Q04Is recycled polyester safe to wear?
Yes, it is widely used in clothing. If you want assurance on chemical residues, ask for OEKO-TEX Standard 100 certification on the finished fabric.
Q05Does recycled polyester cost more?
Usually a little more than virgin polyester for bottle-based yarn, and more again for textile-to-textile or chemically recycled options.