Measuring and mixing cylinders are available in three designs, defined in the standard as tall version with spout, tall version with plug and short version with spout. They base is hexagonal or round. The neck of cylinders with plugs has a so-called tube socket on the inside at the top to ensure that the plug fits exactly. The volume is measured with graduation marks or main point ring graduation, beginning with zero at the base and extending up the cylinder to the nominal volume. The measuring instruments are made of high quality borosilicate glass 3.3 by Duran.
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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.
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