Bio-based

PLA

Q: Can you iron PLA fabric?

Only with great care. PLA softens around 55 to 60 C and melts around 170 C, so a hot iron can glaze or melt it. Use the lowest setting with a pressing cloth, or avoid ironing and hang the garment to let wrinkles fall out.

Polylactic acid, a manufactured polymer that can use fermentation-derived feedstocks.

Reviewed 2026-09-22. Evidence level: verified. Open the interactive profile.

Key figures

US generic name: PLA, recognized by the FTC in 2002
US definition threshold: at least 85% by weight lactic acid ester units from naturally occurring sugars
EU name and criterion: polylactide, melting temperature at least 135 C
Spinning route: melt spinning, with thorough pre-drying

Approximate values under the stated conditions.

Overview

Polylactic acid, a manufactured polymer that can use fermentation-derived feedstocks. Bio-based and biodegradable are different claims.

Feel and behavior

Light, with performance depending on grade and construction.

Where you find it

Nonwovens, fillings, specialty apparel and packaging textiles.

Source and geography

PLA is made from lactic acid obtained by bacterial fermentation of plant sugars, most often from starch crops or sugarcane, rather than from petroleum. The US generic definition ties the fiber to lactic acid ester units derived from naturally occurring sugars. The same resin also serves packaging and 3D printing, so textile fiber shares a supply chain with those markets. The feedstock crop, region and any mass-balance claims should be documented by the resin producer.

Advantages

It is made from fermented plant sugars rather than petroleum.
It wicks moisture and dries quickly, similar to polyester.
It can be composted in industrial facilities that meet EN 13432 conditions.
Melt spinning needs no solvent, unlike acetate or lyocell.

Drawbacks

Its glass transition, about 55 to 60 C, means heat above that range can shrink or distort it.
It melts at around 170 C, so ironing and hot drying can damage it.
It does not break down quickly in seawater, soil or home compost.
Industrial composting access is limited in many areas.

Worth knowing

A 2023 study found PLA textiles did not degrade after more than a year in seawater, while cellulose fibers broke down in about five weeks.
PLA starts to soften at around 55 to 60 C, a temperature a hot wash or dryer can reach.

Types, grades and fabrics

Types and grades

PLA fiber grades are separated mainly by optical purity, the ratio of L-lactide to D-lactide. Grades with very high L content crystallize well and have the highest melting points, around 170 C, making them suitable for filament and staple. Grades with more D content are less crystalline, melt lower and serve as binder or sheath components. Bicomponent fibers pair a high-melting PLA core with a low-melting PLA sheath for thermal bonding in nonwovens. Stereocomplex PLA, which combines L and D polymers, raises heat resistance and has been patented for fibers. Trade forms include staple for fiberfill, continuous filament for apparel and spunbond nonwovens.

Fabrics and products

PLA is used in spunbond and needlepunched nonwovens for wipes, agricultural covers, filters and beverage filter bags, and as fiberfill in pillows and duvets. In apparel, PLA staple is blended with cotton, wool or viscose in T-shirts and base layers, and PLA filament appears in knits and sports clothing, where it wicks like polyester. Because of its low heat tolerance, PLA is less common in garments that need hot washing or ironing, and it is often blended to balance comfort and durability.

Buying and care

How to judge quality

Check the label for PLA content and blends; the US generic name is PLA, and the EU name is polylactide. Look for fabrics that specify care limits, since PLA needs low-temperature washing, drying and ironing. Compostability claims should cite a standard such as EN 13432 or ASTM D6400 and state that industrial composting is required. Be wary of 'biodegradable' claims without conditions or certificates. PLA fabric that feels stiff or shows glossy patches may have been damaged by heat during finishing. Price is usually higher than polyester, so very cheap 'plant-based' fabrics deserve scrutiny.

Care in detail

Wash PLA fabrics in cool to lukewarm water with a mild detergent, staying well below its glass transition of about 55 to 60 C. Air dry or tumble dry on the lowest heat setting only if the label allows, since heat above about 60 C can cause shrinkage. Avoid ironing, or use the lowest setting with a pressing cloth, because PLA melts at around 170 C and can glaze or deform at lower temperatures. Remove stains promptly with cool water; do not use hot water or strong solvents. Store away from heat and humidity, which can speed hydrolysis.

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

PLA's feedstock is plant sugar, so its footprint includes crop land, fertilizer and water, plus energy for fermentation and polymerization. Its end-of-life advantage depends on industrial composting: under EN 13432 conditions, sustained around 58 C with high moisture, PLA disintegrates in weeks and biodegrades within months. In natural environments it persists. A 2023 study by Royer and colleagues at Scripps Institution of Oceanography found that PLA textiles showed no measurable degradation after 428 days in marine waters, while cellulose fibers degraded in about 35 days. Studies in soil and home compost also show slow breakdown. PLA can be recycled chemically back to lactic acid, but collection systems are limited. Claims should specify conditions, per consumer-protection rules.

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

Data sheet

Property	Value	Conditions	Source
Melting point	130 to 170 C	producer data, range across amorphous to crystalline Ingeo fiber grades	[1]
Melting point (EU criterion)	at least 135 C	minimum for the EU fibre name polylactide	[2]

Manufactured from biological inputs

Feedstock origin does not establish biodegradability or a particular impact.

Structure and chemistry

Poly(lactic acid), also called polylactide, is an aliphatic polyester whose repeat unit is a lactic acid residue joined by ester bonds. Lactic acid is chiral, so the polymer contains L and D units, and their ratio controls how well chains crystallize: high optical purity gives a semicrystalline polymer suitable for fiber, while more D content lowers crystallinity and melting point. Lacking the aromatic rings of PET, PLA has a lower glass transition and melting temperature, and its ester links are susceptible to hydrolysis, especially under heat and humidity. Fibers are usually round and smooth.

From source to yarn

Sugars are fermented to lactic acid, which is purified and condensed into lactide, the cyclic dimer of lactic acid. Lactide is purified and polymerized by catalyzed ring-opening polymerization to high molecular weight PLA, then pelletized. Because moisture degrades PLA in the melt, pellets are dried thoroughly before extrusion. The polymer is then melt spun into multifilament or staple, drawn to orient and crystallize the chains, and textured or crimped. Much PLA textile use is as spunbond or other nonwovens, where filaments are laid directly into a web and bonded.

Performance in use

PLA absorbs little moisture and wicks by capillary action rather than absorption, similar in principle to polyester. Its lower heat tolerance than PET is the main practical constraint: dyeing, heat setting, ironing and tumble drying must all stay at lower temperatures, or the fiber shrinks, glazes or loses strength. It is dyed with disperse dyes, like polyester, but under milder conditions. Hydrolysis in hot, humid environments limits service life in some uses. Biodegradation is not rapid in ordinary soil, water or home conditions; meaningful breakdown generally requires controlled industrial composting.

How it is identified

Burn tests are indicative only: PLA melts and burns much like polyester, forming a hard bead, so a flame test cannot reliably separate the two. Laboratory identification relies on FTIR, which distinguishes the aliphatic ester spectrum from aromatic PET, and on thermal analysis such as differential scanning calorimetry, where PLA melts well below PET. Fiber identification literature treats PLA as a separate generic type with its own identification characteristics.

History

Timeline

2002The US Federal Trade Commission granted PLA its own generic fiber name after a petition by Cargill Dow. [3]
2011Regulation (EU) No 1007/2011 listed polylactide as a fibre name, with a minimum melting temperature of 135 C. [2]
2023A marine study found no measurable degradation of PLA textiles after 428 days in seawater, while cellulose fibers degraded in about 35 days. [4]

PLA fiber reflects the development of industrial polymers from biological feedstocks. End-of-life claims depend on defined conditions and available facilities.

The deeper record

PLA's recognition as a textile fiber came through regulatory as well as technical change. Cargill Dow petitioned the US Federal Trade Commission for a new generic name, and in early 2002 the Commission granted PLA generic status. In its analysis the Commission noted that PLA's repeat units are linked by ester groups, making it chemically a polyester, but agreed with the petitioner that it did not fit the existing regulatory definition of polyester. The Commission therefore considered broadening that definition, creating a subcategory, or adding a new generic name, and PLA was established as its own generic name.

Labeling and law

In the United States, the FTC granted PLA a generic fiber name in 2002, defined in 16 CFR 303.7 as a manufactured fiber whose fiber-forming substance is at least 85 percent by weight lactic acid ester units derived from naturally occurring sugars. Regulation (EU) No 1007/2011 uses the name polylactide, adding that the fiber must have a melting temperature of at least 135 C. Compostability or biodegradability claims are separate marketing claims that should cite a named test standard, a certificate and the disposal conditions actually available.

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

Frequently asked

Is PLA fabric compostable at home?

Generally no. PLA needs industrial composting, with temperatures around 58 C and controlled moisture, to break down in weeks. In home compost, soil or seawater it degrades very slowly; one study found no measurable degradation of PLA textiles after 428 days in the ocean.

Can you iron PLA fabric?

Only with great care. PLA softens around 55 to 60 C and melts around 170 C, so a hot iron can glaze or melt it. Use the lowest setting with a pressing cloth, or avoid ironing and hang the garment to let wrinkles fall out.

Is PLA a type of polyester?

Chemically, PLA is an aliphatic polyester, but US regulators gave it its own generic name, PLA, in 2002. It differs from PET polyester in feedstock, heat tolerance and how it breaks down, so the separate name matters for labels.

Is PLA better for the environment than polyester?

It depends. PLA is made from plant sugars and can be composted industrially, but it persists in natural environments and needs special handling. Its footprint depends on crop sourcing, energy use and whether it actually reaches composting or recycling.

Sources

Cite this page

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