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500 ml 4 neck round bottom flask with spherical bottoms; commonly used to contain chemical reactions for chemical or biochemical work, especially for reflux set-ups and laboratory-scale synthesis With four 24/40 standard taper outer Joints Made of borosilicate glass; heavy duty and reusable; maximum withstand temperature 200°C Smooth surface; uniform glass thickness; can better withstand pressure Warranty: StonyLab 1-Year Limited Warranty; if received damaged, please contact us immediately; we will solve it until satisfied