CONSUMER PRODUCTS AND RETAIL E-SSENTIALS

USA: Bisphenol S is added to California proposition 65 list

JANUARY 2024 - ELECTRICAL AND ELECTRONICS, HARDLINES, SOFTLINES, TOYS AND CHILDREN'S PRODUCTS

The California Office of Environmental Health Hazard Assessment (OEHHA) added Bisphenol S¹ (BPS) to the Proposition 65 list² as a reproductive toxicant (female reproductive endpoint) on 29 December 2023. The warning requirement for significant exposures to BPS will take effect one year later.

Bisphenol S belongs to the family of bisphenols, and it is used as a monomer in synthetic polymers such as polyethersulfone (PES), polysulfone (PSU), as a synthetic tanning agent for leather, and in synthetic fibres for clothing and other textiles. In particular, BPS is an analog of Bisphenol A³, both chemically and functionally. Some manufacturers have replaced BPA with BPS.  

In the recent settlement regarding BPA in socks⁴ made of polyester with spandex, the reformulation required that BPA cannot be replaced by any other bisphenols such as BPS even though BPS was not yet been added to the Proposition 65 list at that time. 

[1] Press release by OEHHA

[2] California Proposition 65 List

[3] Evidence on the Female Reproductive Toxicity of Bisphenol S

[4] TÜV SÜD E-ssentials volume 7, 2023

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