Sichem S91

SICHEM® S91 is a biaxially oriented modified microcellular PTFE gasket sheet filled with barium sulfate. Thanks to its high compressibility, it is suitable for use on irregular or damaged surfaces and is particularly well suited for lined or non-metallic flanges with low bolt loads.

The multidirectional structure provides the material with excellent mechanical performance, improving resistance to hot creep and ensuring optimal dimensional stability, even under low and prolonged loads.

High chemical resistance: compatible with a wide range of chemicals, including moderate acids and strong bases, such as potassium hydroxide and sodium hydroxide. PTFE is not compatible with: bromine trifluoride, chlorine trifluoride, fluorine dioxide, hydrogen fluoride, molten alkali metals, elemental lithium, elemental potassium, and elemental sodium. For compatibility with the filler materials used in the Sichem range, please refer to the Chemical Compatibility List.

Superior mechanical stability: the biaxial orientation improves resistance to creep and permanent deformation.

Excellent machinability: easy to punch and CNC cut, ensuring precision even for complex geometries.

Low permeability coefficient: ideal for applications requiring long-term tight sealing.

Operating temperature: from –200°C to +260°C, depending on the type of fluid and the applied load.