韩国美女青草仙桃视频在线观看_亚洲精品一二三在线观看无修改_国产精品无码露脸视频观看_成人爽片不卡视频在线_无码吃奶揉捏奶头高潮视频在线

Zhengwei kettle cover lifts the reactor, the lifting motor drags the rope through the suspender to pull the kettle cover up and down, which is convenient for cleaning the materials in the kettle. The structure is simple and the operation is convenient. It is an ideal device for research institutes and research institutions.

The tetrafluoroethylene material can be used for a long time at -180～260oC. This material is resistant to acid, alkali and various organic solvents, and it is almost insoluble in all solvents. At the same time, polytetrafluoroethylene has the characteristics of high temperature resistance, its friction coefficient is extremely low, and it does not stick to the reaction medium. Therefore, it is widely used in reaction materials that cannot be tolerated by metal materials.