All Types of Teflon Gasket Sheet (Teflon Joint Sealant) - PTFE materials, or Polytetrafluoroethylene materials, are made of synthetic fluoropolymer of tetrafluoroethylene. Most commonly known by the trademark name Teflon, the inert nature of the material means it is highly hydrophobic, has one of the lowest coefficients of friction and is resistant to most chemicals. PTFE gaskets are used in equipment handling chemicals and petrochemicals.