Polytetrafluoroethylene is not as elastic and compressible as rubber and tends to flow or even break at high loads. When the load is higher than 3 MPa, residual deformation occurs, and when it is loaded to about 20 MPa, it will be crushed. Therefore, PTFE PTFE is generally only used as gasket material for grooved flanges, and the load does not exceed 3.5 MPa. The structure used for static sealing is shown in Figure 6.
PTFE has good electrical insulation properties. Its extremely high resistivity and low dielectric loss. Since PTFE does not adsorb and absorb water vapor (it does not absorb water or is infiltrated by water), the surface resistivity is high even at 100% relative humidity. . This property and its resistance to arcing make PTFE PTFE particularly suitable for a variety of applications requiring insulation.
Polytetrafluoroethylene PTFE is chemically stable, which is superior to any other elastic plastic material. It does not react with all known acids and bases, including the three strong acids and hydrofluoric acid. Teflon PTFE does not get wet and does not dissolve in any known solvents (but it dissolves in molten alkali metal). PTFE PTFE is non-flammable, non-toxic and can emit toxic gases only when the heating temperature is higher than 400°C. Due to the inactive nature of Teflon PTFE, it can only be bonded using special methods. The maximum working temperature of the adhesive should be taken into account when bonding.