Whatman 3-Piece filtering funnels are quickly dismantled and ready for the insertion of new filters. The glass sealing flanges of the funnel and reservoir are ground flat to ensure a good filter seal. All retained solids are deposited within the filter circle. The edge clamping prevents peripheral loss and possible passage of solution around, rather than through, the filter circle. The parts can be quickly and efficiently cleaned because of the simplicity of design. For quick and easy filtration, Whatman 3-Piece filter funnels are available with a choice of three plates. They also come in several sizes to match your needs. An acrylic plate is furnished as standard and is suitable for filtration of most aqueous solutions. The acrylic plate has a top working temperature of 65° C. Polypropylene plates are available and are recommended for most acids, alcohols, glycols, ethers, and ketones. PTFE plates are also an option and are used for vitually all common acids, alkalis, and solvents at tempertures up to 100° C, although the maximum working temperature for PTFE plates is 200° C.