Acrylic is not an eco-friendly material by any conventional measure. It starts as a petroleum derivative, sheds microplastic fibers every time you wash it, resists virtually all forms of recycling, and will not biodegrade in any meaningful human timeframe. That said, the environmental picture has enough layers that a flat “it’s bad” undersells what is actually going on, from surprising findings about worker safety to emerging research that could eventually turn old acrylic sweaters into high-performance carbon fiber.
What Acrylic Actually Is and How It Gets Made
Acrylic fabric is made from polyacrylonitrile, a synthetic polymer built from a chemical called acrylonitrile. About 90% of the world’s acrylonitrile comes from a single manufacturing process developed decades ago, which works by reacting propylene (a petroleum byproduct) with ammonia and air over a catalyst at temperatures between 400 and 500 °C.1Journal of Cleaner Production. Life Cycle Assessment comparison of two ways for acrylonitrile production: the SOHIO process and an alternative route using propane That reaction is highly exothermic, meaning it throws off a lot of heat, which has to be carefully managed in specialized reactors. The propylene itself comes from oil refining or natural gas processing, so acrylic’s supply chain is tied to fossil fuels from the very first step.
Once the acrylonitrile monomer is produced, it gets polymerized into long chains and then dissolved in a solvent so it can be spun into fibers. That spinning process generates wastewater loaded with solvents and chemical residues. Dyeing acrylic adds another layer of environmental concern: the wastewater from acrylic-textile dyeing contains surfactants and dispersing agents that resist standard treatment methods, making cleanup slow and resource-intensive.2PubMed. Enhancement of a solar photo-Fenton reaction with ferric-organic ligands for the treatment of acrylic-textile dyeing wastewater From feedstock to finished fabric, acrylic’s manufacturing footprint is firmly in the high-impact category among textiles.
The Microfiber Problem
If you own an acrylic sweater, hat, or blanket, every trip through the washing machine sends tiny plastic fibers down the drain. Research has quantified this: washing acrylic fabric with detergent released roughly 162 mg of microfibers per kilogram of fabric, nearly three times the amount released when washing without detergent. Warmer water makes it worse, with 40 °C washes producing about 1.8 times more fibers than 20 °C washes.3PubMed. Acrylic fabrics as a source of microplastics from portable washer and dryer: Impact of washing and drying parameters Dryers shed fibers too, though into the air rather than water. One consolation is that fiber release drops over time. By the seventh wash-and-dry cycle, shedding was about 45% lower during washing and 67% lower during drying compared to the first cycle, as the loosest fibers work their way out early.3PubMed. Acrylic fabrics as a source of microplastics from portable washer and dryer: Impact of washing and drying parameters
Where do those fibers end up? Many reach wastewater treatment plants, which can filter out 95 to 99% of microplastics. That sounds impressive until you consider the sheer volume: even with that level of removal, a municipal treatment plant can still release around 160 million microplastic particles per day into rivers, lakes, and coastal waters.4PubMed. Wastewater treatment plant effluent and microfiber pollution: focus on industry-specific wastewater Acrylic is consistently identified as one of the most prolific microfiber shedders among synthetic textiles, and because the fibers are plastic, they persist in the environment essentially indefinitely.
What Acrylic Microfibers Do in the Water
The ecological effects of acrylic microfibers are an active area of research, and the picture so far is more nuanced than the headlines about “plastic in our oceans” usually suggest. In laboratory studies on freshwater amphipods (small crustaceans common in streams), acrylic microfibers shorter than 50 micrometers were ingested, but the animals showed a clear avoidance behavior: when given a choice between food contaminated with acrylic fibers and uncontaminated food, they preferred the clean option. That avoidance did not occur with natural fibers like cotton or animal hair, suggesting something about acrylic specifically repels these organisms. Over a 28-day exposure period, though, the acrylic fibers did not affect the amphipods’ growth or survival.5CentAUR. Impact of microfibres on feeding in the freshwater amphipod Gammarus pulex
Studies on estuarine grass shrimp found no mortality at the microfiber concentrations typically measured in coastal environments.6Research Square. The Interactive Effects of Nontoxic Levels of Microplastics – Textile Microfibersand Tire Wear Particles, on the Acute Toxicity of Bifenthrin in the Estuarine Grass Shrimp, Palaemonetes pugio These findings do not mean acrylic microfibers are harmless. They accumulate over time, they can adsorb pollutants from the water around them, and the long-term effects of chronic low-level exposure across entire ecosystems are still poorly understood. But the existing evidence suggests the harm is more subtle and systemic than acutely lethal, which in some ways makes it harder to address because the damage does not announce itself with dead fish.
Why You Cannot Recycle Acrylic
This is where acrylic’s environmental story gets especially grim. With many other synthetic fabrics, there is at least a theoretical path to recycling. Polyester, for example, can be broken down into its original building blocks and repolymerized. Acrylic cannot. Polyacrylonitrile is what chemists call an addition polymer: once the monomers link together, the reaction is essentially irreversible under practical conditions. You cannot depolymerize it back into acrylonitrile the way you can break polyester back into its components.7PubMed. High-quality acrylic fibers from waste textiles
Mechanical recycling is equally problematic. Acrylic fibers are almost always blended with other materials like wool, cotton, or other synthetics, and separating those blended fibers reliably is close to impossible with current technology. Even if you could isolate pure acrylic, reprocessing it through extrusion runs into trouble with the dyes already embedded in the fibers, which contaminate the output and the equipment.7PubMed. High-quality acrylic fibers from waste textiles The result is that most acrylic textiles end up in landfills. Global production of acrylic polymers runs into millions of metric tons per year, and the waste accumulates after every product’s lifecycle with very few viable diversion routes.8Applied Microbiology and Biotechnology. Current status on the biodegradability of acrylic polymers: microorganisms, enzymes and metabolic pathways involved
Biodegradation is not a rescue either. While researchers have identified some microorganisms and enzymes that can break down acrylic polymers under laboratory conditions, the rates are extremely slow and nowhere near practical for waste management at scale. In a landfill, acrylic sits essentially unchanged for centuries.
What Happens When Acrylic Burns
Incineration might seem like the obvious alternative to landfilling, but burning acrylic creates its own problems. The thermal decomposition of polyacrylonitrile produces hydrogen cyanide, ammonia, carbon monoxide, carbon dioxide, and various nitrile compounds.9Journal of the American College of Toxicology. Acrylics: A Literature Review of Thermal Decomposition Products and Toxicity Hydrogen cyanide is acutely toxic, and its release makes burning acrylic more hazardous than burning many natural fibers. Modacrylic fibers, a modified version of acrylic treated with flame-retardant chemicals, produce combustion byproducts that appear even more toxic in acute exposure tests than standard acrylic or wood.
Industrial incineration of acrylic waste also generates polycyclic aromatic hydrocarbons, a class of pollutants linked to cancer risk. Research on incinerating cellulose waste filters from acrylic manufacturing found 13 to 16 different PAH compounds among the 16 priority pollutants, with total PAH levels increasing dramatically at higher temperatures. At 1,000 °C, the total PAH output was roughly 9.4 times higher than at 700 °C.10PubMed. Effect of combustion variables on PAHs emission from incineration of cellulose waste filters from acrylic industry Properly managed waste-to-energy facilities can mitigate some of these emissions, but the chemistry of acrylic combustion makes it inherently more challenging to burn cleanly than many other materials.
Is Acrylic Dangerous to Wear or Work With?
Given that acrylic starts as acrylonitrile, a chemical classified as a possible human carcinogen, people sometimes worry about wearing acrylic clothing. The evidence on this is actually reassuring. The manufacturing process polymerizes the acrylonitrile so thoroughly that only trace amounts of the monomer remain in the finished fiber. The bigger question has been whether workers in acrylic fiber factories, who handle the raw chemical in much higher concentrations, face elevated health risks.
Studies spanning decades have looked at this. Medical examinations of factory workers exposed to acrylonitrile found no detectable health effects attributable to the chemical, though the researchers noted the possibility of slight liver effects in the most heavily exposed workers.11PubMed Central. Health effects of acrylonitrile in acrylic fibre factories A large mortality study following over 2,500 workers across five decades of follow-up found no increased risk of respiratory cancer or other mortality outcomes associated with acrylonitrile exposure. The hazard ratio for respiratory system cancer was essentially 1.0, meaning exposed workers died of lung cancer at the same rate as the general population.12Journal of Occupational and Environmental Medicine. Mortality Among Workers Exposed to Acrylonitrile in Fiber Production: An Update For consumers wearing acrylic garments, the exposure levels are orders of magnitude lower than what factory workers experience, so the health risks from wearing acrylic are negligible. The environmental concerns are real, but personal toxicity from wearing it is not one of them.
How Acrylic Compares as a Practical Textile
Part of why acrylic persists in the market despite its environmental profile is that it performs well for the price. Acrylic mimics wool’s warmth and softness at a fraction of the cost, and it handles moisture differently than natural fibers, which matters in applications like gloves and outdoor accessories. Research comparing wool, acrylic, and high-tech synthetic yarns in winter glove construction found that each had tradeoffs: wool excelled in breathability with the highest air permeability, while synthetic options offered better heat retention.13Journal of Industrial Textiles. Infrared (IR) imaging based comfort appraisal of wool, acrylic, and Thermolite® plaited gloves; Exploring socio-economic materials Acrylic also resists moths and mildew, does not shrink, and maintains its color well over time. These properties make it popular for blankets, craft yarns, and budget knitwear, particularly in markets where wool is too expensive or where consumers need easy-care items.
The durability question cuts both ways, though. Acrylic fabric pills readily and can lose its shape over time with heavy wear, which shortens garment life and sends more material to the landfill sooner. A wool sweater that lasts fifteen years may have a higher per-year environmental cost than an acrylic sweater that lasts five, despite wool’s higher initial footprint, simply because of longevity. This kind of lifecycle thinking rarely makes it into purchase decisions, but it matters when you are comparing the true environmental cost of fabrics.
Can Acrylic Be Made Sustainably?
Several research groups are working on making acrylonitrile from renewable sources instead of petroleum. The most promising route starts with sugars that can be fermented into an intermediate compound called 3-hydroxypropionic acid, which is then converted to acrylonitrile using a simple catalyst. A process published in Science demonstrated molar yields exceeding 90% through this chemistry, and an integrated model achieved near-complete conversion at 98%. The approach eliminates the runaway reaction hazards of the conventional process and avoids producing hydrogen cyanide as a byproduct.14PubMed. Renewable acrylonitrile production
The catch is cost. Techno-economic assessments of bio-based acrylonitrile production in a sugarcane biorefinery found that the minimum selling price for bio-acrylonitrile was roughly three to four times higher than fossil-based acrylonitrile at current market prices. The greenhouse gas reductions were real, with biorefinery routes achieving up to 43% lower emissions for acrylonitrile and up to 97% lower emissions for propylene compared to fossil production.15Biomass and Bioenergy. Biobased propylene and acrylonitrile production in a sugarcane biorefinery: Identification of preferred production routes via techno-economic and environmental assessments But at three to four times the price, bio-acrylonitrile is not going to replace petroleum-based production without either massive subsidies or dramatic improvements in process efficiency. Broader analyses comparing petrochemical and biomass routes have reached similar conclusions: the green chemistry alternatives are scientifically viable but currently lag behind on cost, land use, and energy efficiency.16Catalysis Today. Metrics of acrylonitrile: From biomass vs. petrochemical route
Turning Old Acrylic Into Carbon Fiber
One of the more creative approaches to acrylic waste does not try to recycle it back into clothing at all. Instead, it treats discarded acrylic textiles as a feedstock for carbon fiber, a high-value structural material used in aerospace, automotive, and sporting goods. The idea works because carbon fiber is already made from polyacrylonitrile. Conventional carbon fiber production starts with virgin acrylonitrile, polymerizes it, spins it into precursor fibers, and then carbonizes those fibers at extremely high temperatures. If you start with waste acrylic textiles that are already polymerized, you skip the most energy-intensive and expensive early steps.
A recent study modeled this approach at scale and found that upcycling post-consumer acrylic textiles into structural carbon fiber could cut production costs by about 20% and reduce greenhouse gas emissions by roughly 40% compared to conventional carbon fiber manufacturing. The savings come primarily from avoiding the synthesis of fresh acrylonitrile entirely.17Chemical Engineering Journal. Upcycling post-consumer acrylic textiles into structural carbon fibres with reduced cost and carbon footprint This is still a developing technology, not something happening at commercial scale yet. But it represents one of the few genuinely promising end-of-life pathways for acrylic, because it turns the very property that makes acrylic hard to recycle as a textile, its stable polymer backbone, into an advantage for a completely different product category.
Practical Steps If You Already Own Acrylic
If your closet already has acrylic items, a few adjustments can reduce their environmental footprint. Washing in cold water produces significantly fewer microfibers than warm washes, and skipping detergent when possible (or using a liquid rather than a powder) further reduces shedding.3PubMed. Acrylic fabrics as a source of microplastics from portable washer and dryer: Impact of washing and drying parameters Mesh washing bags designed to capture microfibers can intercept a portion of what comes off in the wash. Washing less frequently and using shorter cycles also helps, not just for microfibers but for garment longevity.
When an acrylic garment reaches the end of its useful life, the options are limited. Donation or resale extends the garment’s life, which is the single most effective way to reduce its per-use impact. Throwing it in a textile recycling bin is well-intentioned but often ineffective: most textile recyclers cannot process acrylic, and blended fabrics especially get downgraded into industrial rags or insulation rather than new fiber. Landfill is the realistic endpoint for most acrylic clothing, which is precisely why buying less of it in the first place remains the most impactful choice. If warmth and softness are what you need, secondhand wool or other natural-fiber alternatives carry a fraction of acrylic’s long-term environmental burden, even accounting for the resources that went into raising sheep or growing cotton.