Nicotine River Erlenmeyer (Conical) Flasks are made of borosilicate glass. They are perfect for mixing chemicals by hand, magnetic stirrer or hotplate. Spillage isn’t just a waste of materials. It can be dangerous. The wide flat bottom and narrow neck of these flasks minimize tipping, splashing and evaporation risks. We sell them in 50ml, 150ml, 250ml, 500ml and 1000ml.