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

The PYREX 250mL Round Bottom Boiling Flask is a durable laboratory flask manufactured from high-quality borosilicate glass for heating, boiling, mixing and chemical solution preparation. It features a short ring neck with a reinforced opening for reliable stopper fitting and enhanced durability. Its spherical bottom promotes uniform heat distribution, making it suitable for educational, research, pharmaceutical and analytical laboratories. Key Features - 250mL Capacity: Suitable for small-volume laboratory heating and chemical preparation. - Borosilicate Glass: Manufactured from PYREX No. 7740 glass for chemical durability and thermal resistance. - Round Bottom Design: Promotes uniform heating during controlled laboratory procedures. - Short Ring Neck: Precisely formed to provide a consistent rubber stopper fit. - Reinforced Rim: Improves strength around the flask opening. - Stopper Compatibility: Accepts a No. 5 rubber stopper. - Thermal Resistance: Suitable for controlled laboratory heating. - Chemical Durability: Resists many commonly used laboratory chemicals. - Reusable Design: Suitable for repeated laboratory operations. 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 Top Style Ring 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 Heating, Boiling, Mixing, Solution Preparation and Laboratory Washing