Full definition
Seals designed for sustained operation above 200 °C. Materials and limits: filled PTFE (+260 °C), expanded graphite (+650 °C in reducing atmosphere), FFKM/Kalrez (+325 °C with universal chemical compatibility), silicone (+230 °C). For industrial ovens, high-pressure steam, extruders and reactors. Require special groove design and preload to compensate for thermal expansion and creep.