Pear-shaped flasks for your lab's boiling, distilling, and evaporating needs. Borosilicate glass flasks are offered with heavy wall construction and will be uncoated or poly-coated for durability. Outer standard taper joints could also be ground or tooled for strength and stability. Select one vertical neck or two necks, one vertical and one angled. a range of capacities including microscale options are offered, yet models are to be used in rotary evaporators.