PYREX 250mL Class A Mixing Volumetric Flask with Glass Standard Taper Stopper 5820-250

The PYREX 250mL Class A Mixing Volumetric Flask with Glass Standard Taper Stopper is precision laboratory glassware designed for accurate solution preparation, chemical dilution, and efficient mixing of liquids and powders. Manufactured from durable borosilicate glass, the flask features a specially designed upper mixing bulb between the stopper and calibration mark to improve mixing efficiency when shaken. Its Class A accuracy, flat-bottom construction, and hollow glass stopper make it suitable for analytical laboratories, pharmaceutical research, chemical testing, educational institutions, and quality control applications. Key Features - 250mL Capacity: Ideal for accurate preparation of laboratory solutions. - Class A Accuracy: Precision volumetric tolerance of ±0.12mL. - Special Mixing Bulb: Upper bulb facilitates effective mixing of liquids and powders. - Mixing Bulb Capacity: Approximately 25mL, equivalent to one-tenth of the flask's rated capacity. - Borosilicate Glass: Offers chemical resistance and durability. - Glass Standard Taper Stopper: No. 16 hollow glass stopper for secure closure. - To Contain Calibration: Calibrated at 20°C for accurate volumetric solution preparation. - Flat Bottom Design: Provides stability on laboratory work surfaces. - Reusable Construction: Designed for repeated professional laboratory applications. Specification Details Brand PYREX Manufacturer Corning Product Code 5820-250 Product Type Mixing Volumetric Flask Capacity 250mL Material Borosilicate Glass Accuracy Class Class A Tolerance ±0.12mL Calibration To Contain (TC) Calibration Temperature 20°C Flask Feature Upper Mixing Bulb Mixing Bulb Capacity Approximately 25mL Stopper Type Hollow Glass Standard Taper Stopper Size No. 16 Neck Style Bulbed Neck Flask Shape Flat Bottom Height Approximately 256mm Outside Diameter Approximately 78mm Quantity per Pack 1 Piece Quantity per Case 1 Piece Reusable Yes Applications Solution Preparation, Liquid Mixing, Powder Dissolution, Analytical Chemistry, Pharmaceutical Testing