Sealing material requirements

    The sealing material should meet the requirements of the sealing function. Due to the different media to be sealed and the different working conditions of the equipment, the sealing materials are required to have different applicability. The requirements for sealing materials are generally:

    1) The material has good compactness and is not easy to leak the medium;

    2) Have proper mechanical strength and hardness

    3) Good compressibility and resilience, and small permanent deformation;

    4) No softening or decomposition at high temperature, no hardening and no brittleness at low temperature;

    5) Good corrosion resistance. It can work for a long time in acid, alkali, oil and other media, its volume and hardness change little, and it does not adhere to the metal surface;

    6) The friction coefficient is small, and the wear resistance is good;

    7) It has the flexibility to join with the sealing surface;

    8) Good aging resistance and durability;

    9) Convenient processing and manufacturing, cheap and easy to obtain materials.

    Obviously, it is impossible for any kind of material to fully meet the above requirements, but materials with excellent sealing properties can meet most of the above requirements.

    Rubber is the most commonly used sealing material. In addition to rubber, graphite tape, polytetrafluoroethylene and various sealants are also suitable for sealing materials.

(Huiputech)