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Borosilicate glass, long neck, round bottom. Designed for nitrogen determination as per Kjeldahl method. As per DIN ISO 12360 standard. Flask measures 9.5" tall, neck diameter measures 0.75", round bottom diameter measures 2.75". Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C.