Polyethylene terephthalate (PET), the ingredient used to make plastic bottles, polyester and other synthetic fibers, contains antimony trioxide, a catalyst used in the polymerization process that produces PET. This substance can leach from PET when heated and is listed by the International Agency for Research on Cancer as “possibly carcinogenic to humans”.
In addition to PET, chemicals used in synthetic textile dyes can also be a potential threat to human health and the environment. Certain types of dyes, for instance azo dyes, release aromatic amines which are carcinogenic.
"Shedding of fiber fragments into the environment is not only about the physical presence of non-biodegradable fiber fragments in the environment; it is also about the chemicals that are carried along the fiber fragments." [9]
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