Made of high quality, Borosilicate glass 8.5" tall, 2.75" diameter. Stem diameter measures 0.5" 200ml capacity Plain Stem Perfect for any science or home laboratory 200ml capacity. This Buchner Funnel is made of high quality Borosilicate glass. Funnel measures 8.5" in length, and has a diameter of 2.75". Funnel stem has a diameter of 0.5". Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C.