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Comparative microfiber shedding from natural, virgin and recycled synthetic textiles under standardised laundering conditions
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Recycled polyester, often marketed as the eco-friendly choice, actually shed slightly more microplastic fibers than regular polyester when washed, and its fibers were even smaller, meaning they could be more easily inhaled or ingested. Cotton released fewer, longer fibers overall, suggesting it may break down into less concerning particles. This matters because as microplastics increasingly show up in our food, water, and even bloodstreams, choosing "recycled" clothing doesn't automatically mean you're reducing your exposure to shed plastic fibers.
Abstract Microfiber release from synthetic textiles is increasingly recognized as a major source of microplastic pollution, yet the performance of recycled materials relative to virgin and natural remains contested. This study provides standardized evidence on microfiber shedding from commercially available garments, comparing recycled and virgin synthetic fibers alongside natural alternatives. A total of 51 garments from five global fashion brands were analyzed, including cotton, polyester (virgin and recycled), and polyamide (virgin and recycled). To capture complementary shedding metrics, two internationally recognized laundering methods were applied: ISO 105-C06 to quantify fiber number and length, and ISO 6330 to measure total fiber number and mass loss under simulated domestic-scale washing conditions. Descriptively, recycled polyester (rPET) released the highest mean number of microfibers (12430 fibers·g −1 ), approximately 55% more than virgin polyester (8028 fibers·g −1 ); however, this difference was not statistically significant across material categories, reflecting high within-group variability. In contrast, fiber length differed significantly by material type, with rPET and recycled polyamide producing significantly shorter fibers (mean 0.42 mm) than cotton and virgin polyester (mean 0.52 mm). Recycled polyamide showed a similar descriptive trend of higher fiber counts relative to its virgin counterpart. While cotton released a greater total fiber mass (1.85 mg·g −1 ), these fibers were longer and fewer in number. Statistical analysis indicated that microfiber shedding was largely driven by fiber type and material properties rather than brand-specific differences. Nevertheless, some garments -particularly from one brand (B-5)- consistently exhibited higher fiber release across both virgin and recycled synthetic materials, suggesting that textile design and manufacturing practices may also influence shedding intensity. These findings challenge assumptions that rPET is a sustainable alternative and emphasize the need for performance-based evaluation of textile materials in efforts to reduce microfiber emissions.
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Lab laundering experiments tested whether fabrics made with recycled cotton or polyester shed more or fewer fibers than conventional fabrics during washing. Results showed no significant difference in shedding related to recycled fiber content, suggesting that recycled textiles do not increase microplastic fiber pollution compared to virgin-fiber equivalents.
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Researchers studied how washing cotton and cotton-polyester fabrics up to 50 times affects how many particles they shed, finding that cotton released significantly more particles than the blended fabric, and that most released particles were smaller than 25 micrometers. Because synthetic polyester fibers in laundry effluent are a recognized source of microplastic pollution in waterways, understanding differences between fabric types helps identify which textiles are higher-risk sources.
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Researchers compared microplastic fiber and fibril release from virgin versus mechanically recycled polyester textiles during abrasion testing. They analyzed four pairs of commercially available textiles that were identical except for the type of polyester used. The findings provide important data for understanding whether the growing use of recycled polyester in clothing changes the amount or character of microplastic shedding during wear.
Mechanically Recycled Textiles: A Source of Microplastic Fiber Emissions
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Mechanically recycled polyester textiles shed significantly more microplastic fibers than virgin polyester during both wear and washing, and the problem worsens with each recycling cycle. This is an important finding because it shows that increasing textile recycling rates, while beneficial for reducing waste, may inadvertently increase microplastic fiber pollution in waterways.
Release of microplastic fibers from synthetic textiles during household washing
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Researchers measured how much microplastic fiber different synthetic fabrics release during home washing, finding that woven fabrics shed more than knitted ones and thicker, heavier fabrics released more fibers overall. Notably, recycled polyester released more microplastic fibers than virgin polyester under the same conditions. The study also found that the optional pre-wash cycle releases significantly more fibers than the main wash, suggesting skipping it could reduce pollution.
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