Why Canada Excludes Fluoropolymers from PFAS Classification
Canada regulators excluded fluoropolymers from PFAS classification based on factors related to environmental behavior and exposure risks.
Fluoropolymers: Excluded from PFAS Classification
Canada excluded fluoropolymers from the broader PFAS classification due to their unique exposure risks and environmental behavior. While per- and polyfluoroalkyl substances (PFAS) face scrutiny for environmental persistence and health risks, fluoropolymers exhibit distinct properties. The Updated Draft State PFAS Report highlights these differences, recommending the exclusion of fluoropolymers based on their environmental stability and low bioavailability. This decision reflects how fluoropolymers differ significantly from other PFAS compounds.
You can also read: PFAS Legislation- What’s Next?
What Are Fluoropolymers?
Fluoropolymers belong to a specific class of fluorinated polymers created through the polymerization or copolymerization of olefinic monomers. These monomers contain fluorine atoms bonded directly to one or both carbon atoms in the olefinic structure. As a result, fluoropolymers have a carbon-only polymer backbone with attached fluorine atoms.
Common examples include polytetrafluoroethylene (PTFE), widely known for its use in non-stick cookware, and fluorinated ethylene propylene (FEP), which is used in wire insulation and chemical-resistant tubing. Unlike other PFAS, fluoropolymers possess unique chemical and physical properties that significantly minimize their environmental and health impacts.
Key Reasons for Excluding Fluoropolymers from PFAS Classification
Regulators excluded fluoropolymers from PFAS classification based on three primary factors related to environmental behavior and exposure risks:
1. Environmental Stability and Non-Degradability
Fluoropolymers exhibit extreme chemical and thermal stability, which prevents them from degrading under natural environmental conditions. Consequently, they do not break down into smaller, hazardous compounds like many other PFAS substances. This stability reduces their contribution to long-term environmental contamination, distinguishing them from more harmful PFAS compounds.
2. Low Bioavailability and Mobility
Fluoropolymers have high molecular weight and low solubility, resulting in minimal bioavailability. Therefore, living organisms are unlikely to absorb these materials, reducing risks of bioaccumulation in wildlife and humans. Additionally, their limited mobility in water and soil prevents widespread contamination, unlike other PFAS that often leach into groundwater and drinking supplies.
3. Limited Potential for Leaching Non-Polymeric PFAS
Although fluoropolymers remain stable, some concern exists regarding the leaching of non-polymeric PFAS, such as processing aids, monomers, and oligomers, during manufacturing or product degradation. However, these risks remain minimal compared to the broader PFAS family. Ongoing research continues to quantify and manage potential exposure risks.
Regulatory and Industry Implications
Excluding fluoropolymers from PFAS regulations significantly impacts industries reliant on these materials. Automotive, aerospace, electronics, and healthcare sectors depend on fluoropolymers for their durability, chemical resistance, and unique performance characteristics. Including fluoropolymers under PFAS regulations could have imposed stringent restrictions, disrupting supply chains for essential products.
By excluding fluoropolymers, regulators recognize the nuanced nature of the PFAS family. This exclusion fosters a targeted, science-based regulatory approach that addresses environmental and health concerns without unnecessarily hindering technological innovation and industrial processes.
Future Assessments and Considerations
Although fluoropolymers are excluded from current PFAS classifications, they are not entirely exempt from future oversight. The report emphasizes that fluoropolymers will undergo separate assessments to better understand their long-term environmental and health impacts. This approach ensures any emerging risks are identified and managed while allowing industries to benefit from the unique properties of fluoropolymers.
As research progresses, regulators, scientists, and industries must collaborate to ensure sustainability and public health remain central to material innovation. By distinguishing fluoropolymers from other PFAS, policymakers can focus on more harmful substances while encouraging the responsible use of materials that provide significant societal benefits.
To read the Updated draft state of per- and polyfluoroalkyl substances (PFAS) report from the Government of Canada click here.