What it is

Fluorotelomer sulfonate used in firefighting foam. Degrades to shorter-chain PFAS in the environment.

Health effects

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Editorial in progress
A full health-effects review for this chemical is being researched and reviewed by our scientific advisors. In the meantime, see the studies and detection data below.

Detected in food

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No detection data yet
We are aggregating data on 4:2 FTS from FDA Total Diet Study, academic research, and independent lab testing. Detection results will appear here as datasets are ingested.

Studies that have tested for 4:2 FTS

  1. FDA Total Diet Study Dataset 12 — PFAS in 2024 U.S. Food Supply — U.S. Food and Drug Administration, Dec 1, 2024 · MDL: 50.0000 ppt
  2. FDA Total Diet Study Dataset 13 — PFAS in 2024 U.S. Food Supply — U.S. Food and Drug Administration, Dec 1, 2024 · MDL: 50.0000 ppt