PYREX 250mL Class A Certified and Serialized Volumetric Flask with Glass Stopper 5680-250

The PYREX 250mL Class A Certified and Serialized Volumetric Flask with Glass Standard Taper Stopper is high-precision laboratory glassware designed for accurate preparation of standard solutions, chemical dilutions, and quantitative analysis. Each flask is individually serialized and calibrated to Class A accuracy standards, with a Certificate of Identification and Capacity traceable to NIST standards. It features a permanent graduation line, easy-to-read white markings, and a No. 16 hollow glass standard taper stopper. Ideal for analytical laboratories, pharmaceutical research, chemical testing, calibration laboratories, and quality control applications requiring reliable volumetric measurements. Key Features - 250mL Capacity: Suitable for accurate preparation of laboratory standard solutions. - Certified Class A Accuracy: Precision tolerance of ±0.12mL. - Individual Serialization: Unique serial number for identification and traceability. - NIST-Traceable Certification: Certificate of Identification and Capacity available online. - ISO/IEC 17025 Calibration: Tested and calibrated in an ISO/IEC 17025-certified laboratory. - Glass Stopper: No. 16 hollow glass standard taper stopper. - Permanent Graduation: Sharp calibration line with easy-to-read white markings. - Long Neck Design: Facilitates precise filling and meniscus alignment. - Flat Bottom: Provides stability on laboratory work surfaces. - Reusable Construction: Suitable for repeated professional laboratory applications. Specification Details Brand PYREX Manufacturer Corning Product Code 5680-250 Product Type Certified Volumetric Flask Capacity 250mL Material Laboratory Glass Accuracy Class Certified and Serialized Class A Tolerance ±0.12mL Calibration Class A Volumetric Calibration Certification NIST-Traceable Certificate of Identification and Capacity Calibration Laboratory ISO/IEC 17025 Certified Graduation Permanent Single Calibration Line Markings White Block Lettering Stopper Type Hollow Glass Standard Taper Stopper Size No. 16 Neck Design Long Neck Base Flat Bottom Height Approximately 253mm Outer Diameter Approximately 78mm Quantity per Pack 1 Piece Quantity per Case 1 Piece Reusable Yes Applicable Standards ASTM E542 and ASTM E288 Applications Analytical Chemistry, Pharmaceutical Testing, Solution Preparation, Quality Control