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20,000ml capacity boiling flask made from high quality, heavy duty Borosilicate 3.3 glass. Flask features a flat base for added stability and allows it to sit on level surfaces. Flask features a narrow neck with a beaded rim. The inner diameter of the flask neck measures 2.8" (71mm) and it's outer diameter measures 3.1" (80mm). Flask stands 19.5" tall and is 14" in diameter at it's widest point.As per DIN ISO 1773 standard. Autoclavable, with superior chemical durability. Low temperature gradient- can withstand high temperatures & thermal shocks. Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C.