Chemical exposure
Some Home Stone Sealers May Contain PFAS
A July 2026 study found fluorinated compounds in most tested U.S. stone sealers, with labeling that can make PFAS-free choices difficult.
A July 17, 2026 study in Environmental Science: Processes and Impacts tested 35 commercial stone sealers from the U.S. market.
The authors said PFAS use in the building industry is widespread, while labeling and measurement gaps make PFAS-free choices harder for consumers.
Total fluorine testing found fluorinated compounds in 81% of the sealers.
Most of the fluorine measured was extractable and organic, which the authors said was most likely PFAS.
Targeted testing for 19 PFAS could explain only part of the organic fluorine, suggesting polymeric PFAS or other low molecular PFAS may be present.
Polyfluoroalkyl phosphate esters were the dominant detected PFAS subclass.
Six products appeared to lack intentionally added PFAS, but the main alternative chemistry was also noted as an area of regulatory debate.
The study does not prove a health effect from using one sealer at home.
It does show that ordinary home products can contain chemicals that are not obvious from the front label.
For consumers, the practical step is to look for explicit PFAS-free claims, ask manufacturers for chemistry details, and avoid using specialty coatings when they are not needed.
