Unseen Substances in rPET Clothing and Their Impact on Workers

Ernest N. Morial New Orleans Convention Center 

Recycled polyester (rPET) made from post-consumer PET bottles may see increasing application in workwear and uniforms as part of corporate sustainability efforts. Although rPET provides environmental advantages, its recycling process can introduce non-intentionally added substances (NIAS), including impurities, degradation products, and chemical residues that differ from those in virgin polyester. In addition, to enhance the performance of recycled materials, additional additives may be incorporated during the manufacturing process. These substances raise concerns for workers who wear such clothing for long periods (8–12 hours), often in conditions involving sweat and friction. Extended skin contact may allow chemicals to migrate from the fabric to the skin, presenting a potential but under-researched occupational exposure route. This research emphasizes the importance of identifying and evaluating NIAS and other chemicals of concern in rPET textiles, as well as assessing related health risks. By connecting sustainability objectives with occupational health, the study highlights the need for scientific data to ensure that environmentally friendly uniforms do not compromise worker safety.

Shih-Wei Tsai, National Taiwan University, Taipei, Taiwan 

National Science and Technology Council, Taipei, Taiwan (NSTC 114-2621-M-002-012) 

Exposure Assessment