FFKM (Perfluoroelastomer) seals are specialty sealing materials engineered specifically for the most demanding operating conditions. Their core advantage lies in delivering reliability that conventional rubber cannot match, excelling in extreme temperatures, aggressive chemical environments, and ultra-high purity applications.

 

Key Properties

Exceptional chemical resistance – Withstands more than 1,600 types of chemicals, including strong acids, strong bases, ketones, esters, ethers, alcohols, aldehydes, fuels and high‑temperature steam. Maintains elasticity and resilience after long‑term exposure to aggressive fluids.

Broad temperature range – Continuous service temperature from –20 °C up to 250–320 °C; intermittent use up to 327 °C or higher.

Excellent sealing performance – Compression set can be kept below 50 % even at 300 °C. Delivers outstanding resistance to compression set and high resilience even in extreme heat and chemically corrosive environments, ensuring long‑term sealing effectiveness.

High purity – Purified FFKM seals exhibit extremely low metal ion content and ultra‑low outgassing, suitable for ultra‑clean environments where contamination is critical.

 

Cure System Options
The performance of FFKM seals depends on the combination of molecular structure and cure system. Based on the type of cure site monomer (CSM), three main crosslinking technologies are available:

Peroxide cure – Heat resistance up to about 230 °C, excellent acid and solvent resistance. The mainstream technology for general‑purpose FFKM.

Bisphenol cure – Heat resistance up to about 280 °C, outstanding resistance to bases, amines, hot water and steam. Suitable for steam and alkaline media.

Triazine cure – Heat resistance up to 315 °C, currently the highest heat‑resistant FFKM system. Tensile strength remains nearly unchanged below 290 °C. Ideal for extreme high‑temperature applications such as aerospace.

 

Typical Applications

Semiconductor manufacturing – Chamber seals for plasma etching, chemical vapor deposition (CVD), photolithography, etc., resisting aggressive process gases like NF₃ and Cl₂.

Chemical processing industry – Seals for pumps, valves, reactors and heat exchangers, resisting strong acids, strong bases and organic solvents.

Oil & gas – Downhole tool seals, wellhead valve seals, resisting sour gases (H₂S, CO₂) and high‑temperature high‑pressure environments.

Aerospace – Seals for engine fuel systems and hydraulic systems, meeting extreme temperature cycling and stringent safety standards.

Pharmaceutical & food – High‑purity seals complying with relevant industry safety standards.