PYREX 250mL Heavy Wall Round Bottom Boiling Flask with Short Neck – 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 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: Approximately 25–30% thicker walls than standard versions for improved mechanical strength. - Borosilicate Glass: Offers excellent chemical resistance and thermal durability. - Round Bottom Design: Promotes uniform heat distribution during controlled heating. - Short Neck: Compact configuration for laboratory apparatus assemblies. - 24/40 Standard Taper Joint: Full-length outer ground-glass joint for compatible laboratory equipment. - Reinforced Construction: Increased mechanical strength without changing the standard outside diameter. - Heat Resistance: Manufacturer-stated normal working temperature of 230°C. - Chemical Durability: Resistant to many common laboratory chemicals. - Reusable Design: Suitable for repeated laboratory operations. 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 version 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 Resistant to thermal shock under appropriate laboratory conditions 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