Volumetric flask is a part of laboratory glassware used in analytical chemistry for the preparation of solutions. It is made of glass of plastic and consists of a flat bottomed bulb with a long neck, usually fitted with a stopper. The stopper. Is normally made in a chemically resistant plastic such as polypropylene rather than glass. The neck has a single ring graduation mark and a label. The label should show the nominal volume, tolerance, calibration temperature, class, relevant manufacturing standard and the manufacturer’s logo.