These PYREX® Boiling Flasks have full length outer 24/40 Standard Taper joints, but with shorter necks. They are manufactured from No. 7740 borosilicate glass and have carefully controlled wall thicknesses to provide the proper balance between thermal expansion and mechanical strength for greater shock resistance. Their excellent chemical durability results in contamination-free results and long life under the toughest lab conditions. The normal working temperature for PYREX® boiling flasks is 230°C.