DURAN® VOLUMETRIC GLASSWARE
Volume measurement – a routine laboratory procedure. So making long-term quality assurance for the associated instrumentation all the more important, from volumetric flasks to stoppers. From one day to the next, with each analysis. Made of DURAN® borosilicate glass 3.3, our volumetric flasks, measuring and mixing cylinders, and burettes offer excellent chemical and thermal resistance, something that is above all reflected in the mechanical properties of the glassware. Thanks to exact processing and precisely calibrated scales, they permit the highly accurate determination and measurement of volumes. DURAN® products are available in two accuracy classes: class A/AS and class B (see the Chapter on Technical Information). The two classes differ in terms of volume tolerances, with class A being the highest accuracy class and class B being approximately half that of class A. Class AS has the same tolerances as class A, but is designed to permit a more rapid outflow. Volumetric glassware which meets the requirements of the German weights and measures regulations display the conformity marking “DE-M”. Volumetric flasks and cylinders are calibrated to measure the exact amount of fluid they contain (“In”), i.e. up to the ring mark on the vessel. This allows, for example, the desired concentration to be set precisely. Pipettes and burettes are calibrated to measure the amount of fluid delivered (“Ex”). This calibration takes into account surface adhesion to the glass / capillary effects. This is however only the case if the waiting times specified in the product information are observed.
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