Sealing on the inside diameter only, the hat-shaped flange packing is primarily used for low pressure outside-packed installations where lack of space precludes the use of Vee or "U" packing. Flange packing is used to retain gas or fluid pressure or to seal out dust or foreign matter for either reciprocating or rotating motions. Most commonly made of leather, flange packings are also available in homogeneous rubber and fabric upon application. The tannages of the leather and impregnations are selected according to the specific operating conditions of temperature, pressure, and medium.

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