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50ml capacity centrifuge tube made of high quality, heavy duty Borosilicate 3.3 glass. Features conical shape and a beaded rim.Tube measures 5.25" tall, and has an inner diameter measuring 1", and an outer diameter measuring 1.1".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.