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conical flask 250 ml borosilicate glass erlenmeyer flask for chemistry lab experiments filtration titration heating solution pack of 2.Narrow mouth erlenmeyer flask/conical flask 250ml pack of 2 glassware.Made up of borosilicate glass with markings for volume of liquid and flask can be heated on flame for increasing temperature of solutions as per experiments performed in chemistry lab for schools and education institute. Pack of 2 glassware