Borosilicate glass volumetric flask, fitted with solid glass stopper, in compliance with ASTM-E288 standard. 7.5 Height with a 1.5 flat base. Capacity 100 ml, Tolerance ±0.080 ml, Stopper No. 13 Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515 C Annealing Point 565 C Softening Point 820 C. Calibrated to contain. Eisco Labs proudly manufactures its own products using state-of-the-art equipment, and following the highest standards of control. Each product is carefully designed by a team of laboratory professionals and experienced engineers with and durability in mind. They are manufactured with only the highest grade, raw materials and according to international standards to ensure that they can withstand use in even the toughest laboratory environments.