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The closely calibrated scales of volumetric products allow very accurate determination and measurement of volumes. The products e.g. by Duran are available in two accuracy classes. The two classes differ in the accuracy of measurement: class A is the highest accuracy class, class AS has the same tolerances as class A, but is designed to permit more rapid outflow. The accuracy of class B is approximately half that of class A. Measuring and mixing cylinder are calibrated for IN, which means volumetric flasks and cylinders are calibrated to measure the amount of fluid contained. So e.g. the desired concentration can be precisely set.
To ensure a long life-time for your measuring and mixing cylinder and to avoid volume changes, the products should not be heated above +180°C in drying cabinets or sterilisers. Do not heat volumetric glassware on a hot plate. The lab glassware should gradually be heated up and cooled down to avoid thermal stresses and thus any possible breakage of the glass.