In 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.
Frequently asked questions (FAQ)
Why is there a public and regulatory discussion about PFAS?
PFAS are highly stable chemicals that persist in the environment for decades, some of which accumulating in water, soil, and organisms. Due to their persistence and potential health risks, regulators have labeled them “forever chemicals.” In response, the European Union (EU) is reevaluating PFAS under the Registration, Evaluation, Authorization and Restriction of Chemicals (REACH) program, and some EU member states have proposed broad restrictions to phase out non-essential uses across Europe.
What role does REACH play?
REACH is the EU’s primary legislation on chemical safety. It covers the registration, evaluation, authorization and restriction of chemicals. The current PFAS restriction proposal under REACH aims to ban or severely limit PFAS in many sectors unless an exemption for an “essential use” applies.
