Our Findel Everyday glassware range offers the best value for your school without compromising on quality. Findel Everyday Conical Flasks with narrow neck are made of heavy-duty borosilicate 3.3 glass and are suitable for school laboratory applications.Features:White enamel graduations.A uniform wall thickness ideal for heating.Reinforced rim to protect against accidental impact.Available in the following sizes:50ml150ml250ml500ml1000mlFindel Everyday Borosilicate glass has the following heat tolerances:Strain Point: -515°CAnnealing Point: 565°CSoftening Point: 820°C.