Flask Conical 500ml, Erlenmeyer, with teflon liner screw cap, borosilicate glass-EIS-CH0430E offers a thoughtfully designed, durable resource for hands-on learning. Made of high quality borosilicate glass Conical shape for spill prevention Screw cap with Teflon lining 500ml capacity. White graduation lines, marked every 100ml Perfect for any science or home laboratory Erlenmeyer conical flask with Teflon lined screw cap. 500ml capacity, with white graduations marked every 100ml. Flask measures 7" tall, and 4" in diameter. Neck diameter measures 0.75". Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C.