Mechanical Sealing Material


Polytetrafluoroethylene (PTFE), also known as teflon/teflon or plastic king, is a copolymer of tetrafluoroethylene monomer. First, it was developed for national defense and cutting-edge technology and development but later it has gradually extended to civil use, which is generally applied to corrosion-resistant pipes, containers, pumps, high frequency communication equipment and wireless electrical equipment with high performance requirements.

PTFE seal has become the common seal material for its unique properties.

Performance of PTFE Seal

Stability: almost all chemical resistance, strong acid, strong alkali or strong oxidizer and organic solvents have no effect on it. 
Thermal stability: pyrolysis temperature above 400 ℃, therefore, it can work within the scope o - 200 ℃ ~ + 350 ℃.
Wear resistance: the friction coefficient of PTFE material is extremely low, only 0.02, which is 1/40 of rubber.
Self-lubricating: the surface of the PTFE material has a prominent self-lubricating property, and almost all of the viscous material cannot adhere to its surface.

Selection of PTFE Seal Material

However, the pure PTFE has the low strength and the abrasion performance is not very perfect. Usually some inorganic particles are put into the polymer PTFE, such as graphite, molybdenum disulfide, molybdenum disulfide, aluminium oxide, glass fiber, carbon fiber and so on to improve its mechanical properties. It also can be used with other polymers, such as polystyrene resin (PHB), polyphenylene sulfide (PPS), polyether ether ketone (PEEK), poly (perfluorinated (ethylene/propylene copolymer (PFEP) blending method to extend its damping temperature range and improve the creep resistance. Therefore, different PTFE materialas produce all knids of PTFE mechanical seals.
properties unit pure PTFE glass fibire filled PTFE carbon filled PTFE
density g/cm3 2.2 2.3 2.08
tensile strength MPa 30 15 13
max. working temperature 260 260 260
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  • Standards for the Polytetrafluoroethylene Series
    Jun 02 , 2018
    Standards for the Polytetrafluoroethylene Series
    1) HG 20536 1993 “Polytetrafluoroethylene lining equipment" stipulates the structure design, manufacture, inspection and acceptance, test methods and storage, loading and unloading transportation an...
  • Characteristics Of PTFE Seal
    May 03 , 2018
    Characteristics Of PTFE Seal
    First, material advantages: polytetrafluoroethylene (PTFE), also known as Teflon / Teflon or plastic King (F4), is a copolymer of tetrafluoroethylene monomer, which has the following advantages;1. che...