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Eisco Labs Glass Erlenmeyer (Conical) Wide Neck Flask 1000ml, Borosilicate ( Single flask ) with 200ml graduations. Made with High Quality Borosilicate glass. Stopper size no.10 Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C.