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聚四氟乙烯夾層墊片是一種良好的靜密封材料，它是由石棉板、橡膠等具有彈性的材料與聚四氟乙烯包復(fù)薄片組成的具有彈性的密封彈片。聚四氟乙烯具有突出的耐化學(xué)腐蝕性能及使用溫度范圍（-180°C - +250°C）廣的特點(diǎn)。除高溫溶融堿金屬與元素氟外它不受任何化學(xué)藥品侵蝕。它的摩擦系數(shù)很低，具有優(yōu)良的耐氣候性能，是最好的不粘材料。
PTFE envelope gasket is a kind of static seals. It is composed of eastic materials such as compressed asbestos sheet, rubber, ceramics, etc. and PTFE envelope cover.
PTFE has superior properties against chemical (not affected by all chemicals except molten alkali metal and fluorine at elevaerd temperature) and temperature （-180°C - +250°C）。 The coefficient of static and dynamic friction of PTFE are very low. PTFE is the best of the "non-stick" material. It has excellent anti weathering and aging characteristics.
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