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Borosilicate glass with one graduation mark. Fitted with chemical resistant polypropylene stopper. As per DIN ISO 1042 standard. Blue graduation. Cap. 100 ml, Tolerance ±0.20 ml, Socket size 14/23 Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C.