Full definition
Aflas, or Tetrafluoroethylene-propylene copolymer (TFE/P), is a unique fluoroelastomer developed by AGC Chemicals, known for its exceptional chemical resistance, particularly in harsh environments where standard FKM elastomers, such as Viton, may fail. This makes Aflas particularly valuable in applications involving strong bases like sodium hydroxide (NaOH) and potassium hydroxide (KOH), as well as amines, steam, hot water, brake fluids, and oilfield drilling fluids that are commonly exposed to hydrogen sulfide (H₂S), carbon dioxide (CO₂), and brine. Aflas maintains performance across a temperature range of -5 to +200°C, although it has limitations at lower temperatures compared to FKM elastomers.
The mechanical properties of Aflas are noteworthy, with a hardness range of 65-90 Shore A and tensile strength ranging from 10 to 17 MPa. It also exhibits excellent compression set characteristics at elevated temperatures, which is critical for maintaining seal integrity under mechanical stress and thermal cycling. The ASTM D2000 classification for Aflas varies depending on the specific formulation, reflecting its versatility in various industrial applications.
Aflas effectively fills the performance gap between standard FKM elastomers, which struggle with bases and amines, and perfluoroelastomers (FFKM), which offer broader chemical resistance but at significantly higher costs, typically 10-50 times that of standard FKM. The cost of Aflas is approximately 2-5 times that of standard FKM, making it a cost-effective alternative for demanding applications. Its key applications include downhole seals in oilfield operations, components in chemical processing environments that deal with caustic substances, automotive exhaust gas recirculation (EGR) systems, and steam service applications, where reliable sealing materials are critical for operational safety and efficiency.