The Telfon Buchner funnel can replace the ceramic Buchner funnel to avoid fragmentation. The Buchner funnel made of polytetrafluoroethylene material has strong corrosion resistance and can be filtered using vacuum or negative pressure suction. It can also be matched with a filter bottle and used for vacuum filtration of crystals or coarse particle precipitation in inorganic preparation. It can prevent the splashing of corrosive solvents. Application: 1. Matched with suction bottles, used for vacuum filtration of crystals or coarse particle precipitation in inorganic preparation; 2. When the precipitation is low, use a small funnel in conjunction with a filter tube.