PYREX 250mL Heavy Wall Round Bottom Boiling Flask with Short Neck and 24-40 Joint – 4320C-250

The PYREX 250mL Heavy Wall Round Bottom Boiling Flask is a durable laboratory glass flask designed for heating, boiling, distillation and chemical solution preparation. Manufactured from high-quality borosilicate glass, it features walls approximately 25–30% thicker than standard PYREX boiling flasks for increased mechanical strength. Its short neck and 24/40 standard taper joint allow secure connections to compatible laboratory glassware, making it suitable for research, pharmaceutical, industrial and educational laboratories. Key Features - 250mL Capacity: Suitable for small-volume laboratory heating, boiling and chemical reactions. - Heavy Wall Construction: Glass walls approximately 25–30% thicker than standard versions for improved mechanical strength. - Borosilicate Glass: Offers excellent chemical durability and thermal resistance. - Round Bottom Design: Promotes uniform heat distribution during controlled heating. - Short Neck: Compact design suitable for laboratory apparatus assemblies. - 24/40 Standard Taper Joint: Full-length outer ground-glass joint for compatible laboratory equipment. - Enhanced Mechanical Strength: Heavy-duty construction for demanding laboratory applications. - Heat Resistance: Manufacturer-stated normal working temperature of 230°C. - Compact Dimensions: Approximately 83mm outside diameter and 140mm overall height. - Reusable Construction: Designed for repeated laboratory applications. Technical Specifications Parameter Specification Brand PYREX Manufacturer Corning Product Code 4320C-250 Product Type Heavy Wall Laboratory Boiling Flask Nominal Capacity 250mL Material Borosilicate Glass Flask Shape Spherical Bottom Type Round Bottom Neck Style Short Neck Wall Construction Heavy Wall Wall Thickness Approximately 25–30% thicker than standard flask Top Style Standard Taper Joint Joint Size 24/40 Joint Type Full-Length Outer Standard Taper Joint Outside Diameter Approximately 83mm Overall Height Approximately 140mm Normal Working Temperature 230°C Thermal Resistance Thermal Shock Resistant Chemical Resistance Excellent Chemical Durability Glass Colour Clear / Transparent Stopper Included No Reusability Reusable Manufacturer Quantity per Pack 1 Piece Manufacturer Quantity per Case 1 Piece Applications Laboratory Heating, Boiling, Distillation, Chemical Reactions and Solution Preparation