Porous filter plate Buchner funnels are manufactured with a medium porosity (45 - 90µm) removable plate. The filtering plate is made from 1/4-Inch thick high density polyethylene with a non-porous circumference to better fasten filter paper to the plate. The filter plate is supported by a multiple ring grid to prevent displacement under vacuum. The funnel also features an integral vacuum connector fitting which accepts 1/2-Inch I.D. tubing. The tube fitting threads into a 3/4-Inch diameter NPT bung. HDPE plastic Buchner funnels are rated for use below 52° C (125° F).