Bisphenol S (BPS)CAS 80-09-1
Marketed as "BPA-free" — same endocrine activity as BPA, sometimes worse.
Toxic Chemical Databases
Substance-specific listings — these flags are for Bisphenol S alone, not for the broader family.
Chemical Type
BPA Replacement — Aromatic Sulfone Diol
Chemical Description
BPS replaced BPA in many "BPA-free" products after regulatory pressure pushed manufacturers off BPA. The chemistry differs only in a sulfone (SO₂) group replacing the methyl bridge between the two phenol rings — but the endocrine activity is essentially the same, and some in-vitro studies suggest BPS may be MORE potent than BPA at certain low-dose endpoints. EU REACH listed BPS as an SVHC in 2017 for endocrine disruption. Now used in thermal-paper receipt coatings (replaced BPA), polycarbonate alternatives, and "BPA-free" epoxy resin systems.
Biological Activity
Severity scores specific to this substance, NOT the parent family average. Differences between siblings are real and meaningful.
Top Health Consequences
- Endocrine disruption equivalent to or greater than BPA
- "BPA-free" marketing claim is materially misleading
- REACH SVHC for endocrine-disruption properties
- Same product applications as BPA — substitution doesn't reduce exposure
Pathways of Exposure
- Migration from "BPA-free" polycarbonate-substitute products
- Skin absorption from current-formulation thermal receipts
- Food contact from "BPA-free" epoxy can liners
Building Materials with Bisphenol S
Listed alphabetically — product categories where this specific substance appears.
"BPA-Free" Epoxy Linings
"BPA-Free" Polycarbonate Products
BPA-Free Plastic Components
Current-Formulation Thermal Paper Receipts
How We Keep Bisphenol S Out of a House
We do not knowingly install anything containing Bisphenol S. Our specifications name the chemistry we refuse, every submittal is screened against it, and substitutions are rejected — which is how a toxin free home stays that way through construction.
If you want a house specified this way from the start, or an existing house assessed for what is already in it, that is the work we do. Earth Bound Homes builds in Los Gatos, San Jose, Santa Clara County and across the San Francisco Bay Area.