Erlenmeyer Flasks Erlenmeyer Flasks, made from high quality heat resistant Borosilicate glass. Uniform thickness with a heavy beaded rim. Accurate to within 5% of rated capacity. Erlenmeyer Flask Rubber Stopper Sizes  10 ml # 0025 ml # 350 ml # 3150 ml # 5250 ml # 6500 ml # 61000 ml # 8