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2 neck round bottom flask used in chemical experiments for distillation, reflux, synthesis reactions, and other operations 2 neck with 19/22 center and side standard taper outer joint; capacity: 100 ml Made of borosilicate glass, it exhibits excellent corrosion resistance and a low coefficient of thermal expansion; stable operating temperature: 450°C Inspect the product for cracks before use; do not heat with open flames; instantaneous temperature changes must not exceed 140°C; the manufacturer is not liable for damages caused by improper operation Warranty: 1-year coverage period for your peace of mind, if received damaged, please let us know and we will solve it promptly