These volumetric flasks are rated ASTM Class B for accuracy, and come with a ground glass stopper. Each flask and stopper are made using borosilicate (heat resistant) glass. Each flask has a single, permanent graduation line etched into the neck of the flask, and its capacity has been printed on the side. Volumetric flasks are a must have for any chemistry lab to accurately manufacture or mix standard solutions. For solutions prepared by weight/volume ratios, a volumetric flask will fit on a standard triple beam or digital balance. They can also be used to compliment your kitchen as an oil or vinegar dispenser.
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