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300ml capacity. This Kjeldahl flask is made of high quality Borosilicate glass. Flask stands 11.5". Base is 3" in diameter. Neck measures 8" long and has a diameter of 1.2". Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C.