Class 'B' borosilicate glass volumetric flask with one graduation mark. Fitted with chemical resistance polypropylene stopper. As per DIN ISO 1042 standard. Blue graduation. Cap. 25 ml, Tolerance ±0.08 ml, Socket size 10/19Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C.Each product is carefully designed by a team of laboratory professionals and experienced engineers with quality and durability in mind. They are manufactured with only the highest grade, raw materials and according to international quality standards to ensure that they can withstand use in even the toughest laboratory environments.