China Sealcon Company

Research on the Performance of Teflon Bellows

In recent years, Teflon bellows have been widely used in nuclear power, non-ferrous metal smelting and petrochemical industry because of their unique corrosion resistance, good fatigue resistance and so on. In order to use the Teflon bellows better, this paper studies the stiffness properties of the Teflon bellows on the basis of the mechanical properties of the PTFE materials and the relevant experimental results, and the corresponding empirical formulas are obtained.

Teflon referred to as PTFE, it is a kind of white waxy thermoplastic. Due to the molecular structure characteristics of PTFE, on the one hand, it has great deformation capacity; on the other hand, it can generate deformation after being stressed like other elastic materials (such as metal). At the same time, it is similar to viscous substances (such as polymer molten fluid). The deformation is not only related to load and temperature, but also affected by time factors, that is, "viscoelastic" characteristics.
The large deformation capacity of PTFE is much larger than that of common metal materials, and the fracture elongation of PTFE is measured as 233% according to GB1040-79. This ability to deform is due to its unique molecular structure. PTFE is a straight chain nonpolar polymer. No branched chain exists in the molecule. Due to the regularity of the chain and the symmetry of the molecules, large molecules are easy to be arranged in parallel, and a large molecule can be folded back and forth. In the polymer, the ordered crystal region can be formed, with high crystallinity, generally 57~75% and up to 93~97%. PTFE is commonly used as a "mixture" between solid crystal zone and amorphous zone.

Related News
  • Sealing Sense

    Sealing Sense

    November 29, 2017Thermal growth rate differences of head flanges, tube-sheets, bolts and gaskets create an upset of the gasket-flange interface and a loss of seating stress on the gasket that can cause flanges to leak...view
  • Classification Of Rubber Seal Ring

    Classification Of Rubber Seal Ring

    May 4, 2018There are all kinds of rubber seal rings in rubber seal factory. According to the ssutting shape, it can be divided as follows:O seal ring series (DSH seal series)It has many kinds of products, such a...view
  • Leakage Analysis And Maintenance Of Mechanical Seal

    Leakage Analysis And Maintenance Of Mechanical Seal

    May 4, 2018Leakage analysis and maintenance of mechanical seal1. Repair of mechanical sealMechanical seal flygt pump do not need special tools and materials for maintenance. Generally speaking, mechanical seals ...view
  • Common Problems In Mechanical Seal Pump

    Common Problems In Mechanical Seal Pump

    May 4, 2018The following are several common failure about the seal of mechanical seal flygt pump:(1). Leakage during installation of static test. After the mechanical seal is installed and debugged, the static p...view
  • The Mechanical Seal Of The Pump

    The Mechanical Seal Of The Pump

    May 4, 2018The mechanical seal of the pump is the material or part that prevents the leakage of fluid or solid particles from the adjacent surface and prevents the external impurities, such as dust and water, in...view
  • Sealing Technology

    Sealing Technology

    May 4, 2018Sealing technology mainly refers to the use of a certain combination of sealing materials, sealing elements and the corresponding seal structure form, to prevent or cut off the mass transfer process b...view