PYREX 250mL Class A Mixing Volumetric Flask with No. 16 Glass Standard Taper Stopper

The PYREX 250mL Class A Mixing Volumetric Flask is precision laboratory glassware designed for accurate solution preparation, dilution and reagent mixing. Manufactured from durable borosilicate glass, it features an upper mixing bulb, permanent calibration line, flat-bottom body and No. 16 glass standard taper stopper. The additional bulb provides space for efficient mixing of liquids and powders when shaken, making it suitable for analytical chemistry, pharmaceutical testing, quality control and research laboratories. Key Features - 250mL calibrated capacity for precise laboratory solution preparation. - Class A volumetric accuracy with ±0.12mL tolerance. - Special upper mixing bulb to improve mixing when shaken. - Approximately 25mL upper mixing bulb capacity, equivalent to one-tenth of the rated flask capacity. - No. 16 standard taper hollow glass stopper included. - Durable borosilicate glass construction. - Permanent single calibration mark for accurate measurements. - Flat-bottom design for stable laboratory placement. - Bulbed-neck design provides additional mixing space above the calibration line. - Calibrated To Contain (TC) at 20°C. - Reusable for laboratory applications. - Suitable for reagent preparation, dilution and mixing of liquids or dissolved powders. Specification Details Brand PYREX (Corning) Product Code 5820-250 Capacity 250mL Accuracy Class Class A Volumetric Tolerance ±0.12mL Material Borosilicate Glass Flask Type Mixing Volumetric Flask Special Feature Upper Mixing Bulb Upper Bulb Capacity Approximately 25mL Mixing Bulb Location Between Calibration Mark and Stopper Calibration Type To Contain (TC) Calibration Temperature 20°C Stopper Size No. 16 Stopper Type Standard Taper Glass Stopper Material Glass Stopper Design Hollow Glass Flask Shape Flat Bottom Neck Style Bulbed Neck Approximate Height 256mm Approximate Outer Diameter 78mm Reusable Yes Quantity per Pack 1 Flask Quantity per Case 1 Flask Replacement Stopper Series PYREX 7650 Flask and Stopper Supplied Yes Primary Applications Solution Preparation and Reagent Mixing