According to these specifications, volumetric flasks come in two different classes. Volumetric flasks are of various sizes, containing from 1 milliliter to 20 liters of liquid.Ĭalibration and toleration standards for volumetric flasks are defined in the following standard specifications and practices: ASTM E288, E542, E694, ISO 1042, and GOST 1770-74. The flask's label also indicates the nominal volume, tolerance, precision class, relevant manufacturing standard and the manufacturer's logo. The marking is typically calibrated "to contain" (marked "TC" or "IN") at 20 ☌ and indicated correspondingly on a label. The marking indicates the volume of liquid contained when filled up to that point. The neck of volumetric flasks is elongated and narrow with an etched ring graduation marking. The flask's mouth is either furnished with a plastic snap/screw cap or fitted with a joint to accommodate a PTFE or glass stopper. These flasks are usually pear-shaped, with a flat bottom, and made of glass or plastic. Volumetric flasks are used for precise dilutions and preparation of standard solutions. A volumetric flask ( measuring flask or graduated flask) is a piece of laboratory apparatus, a type of laboratory flask, calibrated to contain a precise volume at a certain temperature.
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