Rapid CH200000 Heavy Duty Borosilicate Glass Beaker Range - Rapid CH200002, Rapid CH200002 Heavy Duty Borosilicate Glass Beaker 250ml beaker made of high quality, heavy duty, borosilicate 3.3 glass. 5mm thick uniform walls provide excellent strength against breakage. 250ml capacity. Beaker features 50ml white printed graduations and has a ±5% accuracy. Beaker measures 4.3" tall, and has an inner diameter of 2.5" and an outer diameter of 2.75". Microwavable and autoclavable with superior chemical durability. Low temperature gradient- can withstand high temperatures & thermal shocks. Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point 515°C | Annealing Point 565°C | Softening Point 820°C. Rapid CH200002 Heavy Duty Borosilicate Glass Beaker 250ml pack of 12