PYREX 250mL Round Bottom Boiling Flask with Short Ring Neck – 4260-250

The PYREX 250mL Round Bottom Boiling Flask is a durable laboratory glass flask designed for heating, boiling, mixing and chemical preparation. Manufactured from high-quality borosilicate glass, it features a reinforced short ring neck for secure stopper fitting and improved mechanical strength. Its round-bottom construction supports uniform heating and reliable performance in research, educational and analytical laboratories. Key Features - 250mL Capacity: Ideal for small-volume laboratory heating and chemical preparation. - Borosilicate Glass: Manufactured from PYREX No. 7740 glass for excellent thermal and chemical resistance. - Round Bottom Design: Promotes uniform heat distribution during controlled heating. - Short Ring Neck: Precisely tooled to provide a consistent rubber stopper fit. - Reinforced Rim: Improves mechanical strength and durability. - Stopper Compatibility: Accommodates a No. 5 rubber stopper. - Heat Resistance: Normal working temperature of 230°C. - Chemical Durability: Resistant to a wide range of laboratory chemicals. - Reusable Construction: Suitable for repeated laboratory applications. - Versatile Applications: Suitable for boiling, mixing, solution preparation and routine laboratory washing. Parameter Specification Brand PYREX Manufacturer Corning Product Code 4260-250 Product Type Laboratory Boiling Flask Nominal Capacity 250mL Material No. 7740 Borosilicate Glass Flask Shape Spherical Bottom Type Round Bottom Neck Style Short Ring Neck Mouth Design Reinforced Ring Opening Rubber Stopper Size No. 5 Stopper Included No Outside Diameter Approximately 83mm Overall Height Approximately 120mm Normal Working Temperature 230°C Thermal Resistance Thermal Shock Resistant Chemical Resistance Excellent Chemical Durability Glass Colour Clear / Transparent Reusability Reusable Quantity per Pack 1 Piece Quantity per Case 1 Piece Applications Laboratory Boiling, Heating, Mixing and Solution Preparation