PYREX 250mL Certified and Serialized Class A Volumetric Flask with No. 16 Glass Standard Taper Stopper

The PYREX 250mL Certified and Serialized Class A Volumetric Flask is precision laboratory glassware designed for accurate solution preparation, dilution and volumetric measurements. Manufactured from durable borosilicate glass, it features a permanent calibration line, individual serial identification and No. 16 glass standard taper stopper. Each flask has an accessible NIST-traceable Certificate of Identification and Capacity, making it suitable for analytical chemistry, pharmaceutical testing, quality control and laboratory research. Key Features - 250mL capacity for accurate laboratory solution preparation. - Certified and Serialized Class A accuracy with ±0.12mL tolerance. - Individually serialized for identification and calibration traceability. - NIST-traceable Certificate of Identification and Capacity available online. - Tested and calibrated in an ISO/IEC 17025-certified laboratory. - No. 16 standard taper hollow glass stopper included. - Durable PYREX borosilicate glass construction. - Sharp permanent graduation line for precise volumetric measurements. - Large white block markings for easy reading. - Long narrow neck for controlled filling to the calibration mark. - Flat-bottom construction for stable laboratory placement. - Calibrated according to ASTM E542 and ASTM E288. - Reusable for pharmaceutical, chemical, educational and research laboratory applications. Specification Details Brand PYREX (Corning) Product Code 5680-250 Capacity 250mL Accuracy Class Certified and Serialized Class A Volumetric Tolerance ±0.12mL Material Borosilicate Glass Flask Type Certified Volumetric Flask Calibration Standards ASTM E542 and ASTM E288 Calibration Traceability NIST Traceable Calibration Laboratory ISO/IEC 17025-Certified Laboratory Documentation Certificate of Identification and Capacity Serialization Individually Serialized Stopper Size No. 16 Stopper Type Glass Standard Taper Stopper Material PYREX Glass Stopper Design Hollow Glass Flask Shape Flat Bottom Neck Style Long Neck Height Approximately 253mm Outer Diameter Approximately 78mm Graduation Permanent Single Calibration Line Markings White Block Lettering Reusable Yes Quantity per Pack 1 Flask Quantity per Case 1 Flask Replacement Stopper PYREX Series 7650 No. 16 Flask and Stopper Supplied Yes