Baby Safety / Compounds / 4:2 FTS (4:2 Fluorotelomer sulfonate)

Is 4:2 FTS (4:2 Fluorotelomer sulfonate) safe for babies and kids?

Elevated risk for kids

Infants accumulate 4:2 FTS (4:2 Fluorotelomer sulfonate) through breast milk (bioconcentration), placental transfer, and dust ingestion. Persistent pollutants concentrate in fatty tissues with extended half-lives in developing organisms.

What is 4:2 fts (4:2 fluorotelomer sulfonate)?

The IUPAC name is 3,3,4,4,5,5,6,6,6-nonafluorohexane-1-sulfonic acid.

Also known as: 4:2 Fluorotelomer sulfonic acid, 1H,1H,2H,2H-Perfluorohexanesulfonic acid, 3,3,4,4,5,5,6,6,6-nonafluorohexane-1-sulfonic acid, DTXSID30891564.

IUPAC name
3,3,4,4,5,5,6,6,6-nonafluorohexane-1-sulfonic acid
CAS number
757124-72-4
Molecular formula
C6H5F9O3S
Molecular weight
328.15 g/mol
SMILES
C(CS(=O)(=O)O)C(C(C(C(F)(F)F)(F)F)(F)F)(F)F
PubChem CID
20734543

Risk for babies

Elevated risk

Infants accumulate 4:2 FTS (4:2 Fluorotelomer sulfonate) 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.

What to do: 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.

Risk for pregnant and nursing people

Elevated risk

4:2 FTS (4:2 Fluorotelomer sulfonate) persists in maternal adipose tissue and is mobilized during pregnancy and lactation. Lipophilic pollutants concentrate in breast milk and cross the placenta during critical developmental windows.

Suspected reproductive toxicant (GHS H361) or suspected endocrine disruptor. Precautionary approach warranted. Animal studies or limited human data suggest developmental toxicity potential.

What to do: Minimize exposure during pregnancy and lactation. Consult healthcare provider regarding specific risks. Consider alternative products with lower hazard profiles.

Regulatory consensus

1 regulatory bodyhas classified 4:2 FTS (4:2 Fluorotelomer sulfonate).

AgencyYearClassificationNotes
EPA——

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 4:2 fts (4:2 fluorotelomer sulfonate)

  • Firefighting Foam — AFFF formulations, Fire training areas
    Component of both legacy and current-generation AFFF
  • Drinking Water — AFFF-impacted groundwater
    EPA UCMR5 analyte

Safer alternatives

Lower-risk approaches that achieve a similar outcome to 4:2 FTS (4:2 Fluorotelomer sulfonate):

  • Fluorine-free firefighting foam (F3)
    Trade-offs: Functional performance and cost-effectiveness may vary by application.
    Relative cost: Lower (ingredient elimination)

Frequently asked questions

Is 4:2 fts (4:2 fluorotelomer sulfonate) safe for kids?

Infants accumulate 4:2 FTS (4:2 Fluorotelomer sulfonate) 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 4:2 fts (4:2 fluorotelomer sulfonate)?

4:2 FTS (4:2 Fluorotelomer sulfonate) appears in: AFFF formulations (firefighting foam); Fire training areas (firefighting foam); AFFF-impacted groundwater (drinking water).

What should I do if my child is exposed to 4:2 fts (4:2 fluorotelomer sulfonate)?

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 4:2 FTS (4:2 Fluorotelomer sulfonate) in the baby app

Look up products containing 4:2 fts (4:2 fluorotelomer sulfonate), compare to alternatives, and explore the full data record.

Open in baby View raw API data

Sources (1)
  1. — expert_curation

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 →