Volumetric flasks are built with customers requirements in mind. They conform to tight capacity tolerances and assure accurate reproducible results. The flasks have built- in strength too. The flask body is specially blown and accurate bore tubing is used for the neck. And above all, you have interchangeable solid glass stoppers for durability and convenience. In capacities from 1 ml to 5000 ml, E.S.A.W brand volumetric flasks are available in Class A accuracy, certified by us and Class B accuracy for general purpose work.