Gaskets 
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PTFE gasket compression and cold flow and creep under high temperature, it is generally used for low-voltage, medium-temperature, high corrosion and allowing contaminated media such as acids, alkalis, halogens, medicines and so on. Safety temperature at 150 ℃, pressure 1 MPa or less. PTFE although the intensity higher, but the use of temperature does not exceed 200 ℃, otherwise the corrosion resistance decreases. PTFE envelope gaskets generally does not exceed the maximum working pressure 2MPa. As temperature increases, the material creep, resulting in sealing pressure decreased significantly. Even without heating, with the time, the compression stress of the sealing surface will fall, resulting in "stress relaxation phenomenon" This phenomenon is generated in a variety of gasket, PTFE gasket is a stress relaxation phenomenon is more serious . should be noted.
PTFE gasket friction coefficient is small (compression stress is less than 4MPa, the friction coefficient of about 0.035 a 0.04), preload when the gasket slip out easily, so the best use of bump-type flange. When using flat flange, you can contact with the gasket diameter bolts, the bolts to prevent gasket outer slide. Two kinds of PTFE package pads with a diameter of not greater than 300mm, the available diameter 300mrn more devices, in particular glass-lined equipment and piping. Since glass-lined equipment is sprayed with a layer on the metal surface after sintering enamel glaze layer is very brittle, coupled with uneven spray and glaze layer flow.
Flange flatness is poor. Metal gaskets easily damaged enamel layer, it is recommended to use the core material is asbestos plus rubber PTFE
Vinyl wrapped pad This package pad is both easy and flange fitting and corrosion, with favorable results.
Many plant in the temperature, the pressure is not high strength corrosive medium, the use of asbestos rubber sheet Teflon tape wrapped around outside for frequent removal manholes, pipe. As the production, easy to use, very popular.
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