Learn why PTFE can be FPA-free but not PFAS-free, and why fluoropolymers remain essential for safe, high-performance sealing in regulated industries.
n discussions about PTFE and other fluorinated materials, the terms FPA-free and PFAS-free are often used interchangeably. However, chemically, they describe two very different concepts.
PFAS
PFAS refers to a broad class of per- and polyfluoroalkyl substances. This group includes fluoropolymers such as PTFE and FKM, which are high-performance materials also used in sealing systems where safety, chemical resistance and long-term stability are essential. These polymers enable gaskets that can withstand extreme temperatures, aggressive media and high pressures without degrading.
In many industries – chemical processing, aerospace, semiconductors, pharmaceuticals, energy, marine and food production – no technically viable substitutes exist. Restricting fluoropolymers would jeopardize emission control, operational safety and system integrity.
FPA-free
FPA-free specifically refers to the absence of fluorinated polymerization aids (FPAs) in the PTFE manufacturing process. FPAs are auxiliary, PFAS-based substances used during PTFE polymerization. Although they do not remain in the final polymer, they are increasingly regulated due to their persistence in the environment and potential toxicity.
Therefore, a PTFE gasket material can be:
- FPA-free: produced without harmful PFAS-based processing aids
- Not PFAS-free: because PTFE itself is a PFAS
This distinction is crucial for regulatory accuracy, compliance communication and technical documentation. Using the correct terminology ensures transparency and acknowledges the chemical nature of PTFE-based sealing materials, such as the FPA-free KLINGER top-chem gasket material.