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Erlenmeyer Flask with a 1000mL capacity and narrow neck is made of heavy-duty borosilicate 3.3 glass.Features white enamal graduations every 200mL, a uniform wall thickness ideal for heating, and a reinforced rim to protect against accidental impacts. Meets DIN ISO 1773 standards for conical flasks.Autoclavable, with superior chemical durability. Low temperature gradient - can withstand high temperatures & thermal shocks.