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About Us HUAOU Glassware was founded in 1967, specializing in manufacturing laboratory glassware. We have more than 40 categories main products including 1000 sizes like bumer category, measured category, regent bottles, specimen jar, aspirator bottles, filtering flask, desiccator, funnels, test tubes, etc. HUAOU 25ml volumetric flask with ground glass stopper, Class A Tolerance ±0.03 ml, is made of 3.3 Borosilicate glass, which has high heat resistance, acid and alkali resistance and good stability. Their uniform wall thickness provides the proper balance between mechanical strength and thermal shock resistance. Great for lab and home school science experiments. The volumetric flask is a thin-necked pear-shaped flat-bottomed volumetric container with a ground glass stopper and a marking line on the neck, indicating that when the liquid concave liquid surface is tangent to the marking line on the neck of the capacity at the indicated temperature, the volume of the solution is exactly equal to the volume marked on the bottle. The volumetric flask is an accurate instrument for preparing an accurate solution of a certain substance concentration. If you have any questions or suggestions on our products or service, please do feel free to contact us. You'll get our reply within 24 hours. Thanks for your patience.