普通单一叶蜡石材料传压密封介质在高温高压下容易发生相变，影响介质的使用性能。
The phase change of ordinary pressure-transfer sealing medium made by pyrophylite occurs under high temperature and high pressure, which influences the medium's functions.
高温高压合成超硬材料需要密封介质，叶蜡石是目前国内使用最普遍的密封、传压、保温、绝缘材料。
Pyrophyllite is the most common seal, pressure transfer and heat preservation, insulation material in domestic at present.
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