PYREX 250mL Class A Lifetime Red Volumetric Flask with Glass Stopper 5660-250

The PYREX 250mL Class A Lifetime Red Volumetric Flask with Glass Standard Taper Stopper is high-precision laboratory glassware designed for accurate preparation of standard solutions, chemical dilutions, and quantitative analysis. Manufactured from durable borosilicate glass, it features a permanent etched calibration line within a narrow red band for excellent visibility and long-lasting measurement accuracy. The flask is calibrated to contain 250mL and includes a No. 16 standard taper hollow glass stopper. It is suitable for chemical laboratories, pharmaceutical research, clinical testing, educational institutions, and quality control applications. Key Features - 250mL Capacity: Ideal for accurate preparation of standard laboratory solutions. - Class A Accuracy: Precision tolerance of ±0.12mL. - Lifetime Red Marking: Permanent etched calibration line for enhanced visibility and durability. - Borosilicate Glass Construction: Excellent chemical resistance and durability. - Glass Stopper: No. 16 standard taper hollow glass stopper for secure closure. - Reinforced Neck: Heavy-tubing neck construction improves mechanical strength. - To Contain Calibration: Designed for accurate volumetric solution preparation. - Reusable Design: Suitable for repeated professional laboratory applications. Specification Details Brand PYREX Manufacturer Corning Product Code 5660-250 Product Type Volumetric Flask Capacity 250mL Material Borosilicate Glass Accuracy Class Class A Tolerance ±0.12mL Calibration To Contain (TC) Graduation Lifetime Red Etched Mark 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 6 Pieces Quantity per Case 12 Pieces Reusable Yes Applicable Standards ASTM E694, E542 and E288 Applications Analytical Chemistry, Solution Preparation, Laboratory Testing