Is PFHxS (Perfluorohexane sulfonic acid) safe for babies and kids?
High risk for kidsInfants accumulate PFHxS (Perfluorohexane sulfonic acid) through breast milk (bioconcentration), placental transfer, and dust ingestion. Persistent pollutants concentrate in fatty tissues with extended half-lives in developing organisms.
What is pfhxs (perfluorohexane sulfonic acid)?
The IUPAC name is 1,1,2,2,3,3,4,4,5,5,6,6,6-tridecafluorohexane-1-sulfonic acid.
Also known as: 1,1,2,2,3,3,4,4,5,5,6,6,6-tridecafluorohexane-1-sulfonic acid, Perfluorohexanesulfonic acid, Perfluorohexane-1-sulphonic acid, PFHxS.
- IUPAC name
- 1,1,2,2,3,3,4,4,5,5,6,6,6-tridecafluorohexane-1-sulfonic acid
- CAS number
- 355-46-4
- Molecular formula
- C6HF13O3S
- Molecular weight
- 400.12 g/mol
- SMILES
- C(C(C(C(F)(F)S(=O)(=O)O)(F)F)(F)F)(C(C(F)(F)F)(F)F)(F)F
- PubChem CID
- 67734
Risk for babies
High riskInfants accumulate PFHxS (Perfluorohexane sulfonic acid) through breast milk (bioconcentration), placental transfer, and dust ingestion. Persistent pollutants concentrate in fatty tissues with extended half-lives in developing organisms.
Neonates and infants up to 12 months have incomplete blood-brain barrier development, immature Phase I/II metabolic enzymes (particularly CYP3A4, UGT1A1), and higher gastrointestinal permeability. Equivalent doses produce higher internal concentrations and longer residence times.
Risk for pregnant and nursing people
High riskPFHxS crosses the placenta and accumulates in fetal tissues. Maternal-fetal transfer rates are similar to other PFAS (umbilical cord blood PFHxS is approximately 30–60% of maternal serum levels). Developmental effects associated with maternal PFHxS exposure include altered fetal thyroid hormone levels (T4, free T4 — critical for neurodevelopment), reduced birth weight, and impacts on neonatal immune programming. PFHxS is transferred in breast milk, extending developmental exposure beyond birth. The very long half-life of PFHxS means that body burden accumulated years before pregnancy remains biologically active during gestation — even women who discontinue PFAS exposure prior to conception may retain meaningful PFHxS body burden throughout pregnancy. This makes PFHxS particularly difficult to remediate through individual dietary behavior change alone for women planning pregnancy near contaminated sites.
Regulatory consensus
1 regulatory bodyhas classified PFHxS (Perfluorohexane sulfonic acid).
| Agency | Year | Classification | Notes |
|---|---|---|---|
| IARC | 2023 | Group 1 | IARC Group 1 for PFHxS as part of the 2023 PFAS evaluation. PFHxS is a six-carbon perfluorosulfonic acid that is a primary PFOS replacement and shares PFOS's thyroid-disrupting and immunotoxic profile. PFHxS has the longest known biological half-life among regulated PFAS — approximately 7.3–8.5 years in humans — meaning it bioaccumulates with routine exposure and is extremely slowly eliminated. IARC's Group 1 classification reflects epidemiological evidence for thyroid cancer and limited evidence for other cancers, alongside mechanistic evidence. EPA established an individual MCL of 10 ppt (ng/L) for PFHxS in drinking water under the April 2024 PFAS regulation. PFHxS is included in the Stockholm Convention Annex A for global phase-out. |
Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.
Where kids encounter pfhxs (perfluorohexane sulfonic acid)
- Industrial Facilities — Manufacturing plants, Chemical storage areas, Waste treatment sites
- Occupational Environments — Factories, Warehouses, Transportation vehicles
Safer alternatives
Lower-risk approaches that achieve a similar outcome to PFHxS (Perfluorohexane sulfonic acid):
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Exposure reduction (environmental contaminant)
Trade-offs: Removes 95-99% of dissolved contaminants including metals, PFAS, nitrates; wastes 2-4 gallons per gallon produced (improving with newer systems); removes beneficial minerals; $0.05-0.25/gallon; requires pre-treatment for longevity.Relative cost: 1.2-2×
Frequently asked questions
Is pfhxs (perfluorohexane sulfonic acid) safe for kids?
Infants accumulate PFHxS (Perfluorohexane sulfonic acid) through breast milk (bioconcentration), placental transfer, and dust ingestion. Persistent pollutants concentrate in fatty tissues with extended half-lives in developing organisms.
What products contain pfhxs (perfluorohexane sulfonic acid)?
PFHxS (Perfluorohexane sulfonic acid) appears in: Manufacturing plants (Industrial facilities); Chemical storage areas (Industrial facilities); Factories (Occupational environments); Warehouses (Occupational environments).
What should I do if my child is exposed to pfhxs (perfluorohexane sulfonic acid)?
Minimize infant exposure through source control. For breastfeeding mothers: reduce maternal exposure. For formula-fed infants: use certified low-migration bottles and verified water sources. Consult pediatrician regarding any concerns.
See PFHxS (Perfluorohexane sulfonic acid) in the baby app
Look up products containing pfhxs (perfluorohexane sulfonic acid), compare to alternatives, and explore the full data record.
Open in baby View raw API dataSources (2)
- IARC Monographs Volume 135: Perfluorooctanoic Acid and Its Salts and Other Per- and Polyfluoroalkyl Substances — PFHxS Group 1 Classification; Thyroid Cancer Evidence; Immunotoxicity (2023) (2023) — regulatory
- US EPA: National Primary Drinking Water Regulations for PFAS (April 2024 Final Rule) — PFHxS Individual MCL 10 ppt; Hazard Index Mixture Grouping (2024) — regulatory
Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →