Sonic Supply offers a range of polypropylene, borosilicate glass, and porcelain buchner funnels from Globe Scientific and United Scientific Supplies. These funnels are used as a filtration device in laboratories. All buchner funnels feature a porous plate with holes and slots for filtering. Common applications for buchner funnels include separating solids and liquids through gravity filtration. Capacities range from 3mL to 4800mL.