Highly durable, 3.3 low expansion ASTM E-438 Type I Class A borosilicate glass is used for PUREGRIP® glass bottles, flasks and carboys. Bottle sizes come in 100 mL, 250 mL, 500 mL, 1 L, 2 L, 3 L, 5 L, 10 L and 20 L, with a choice of clear or amber glass. PUREGRIP® flasks range from 250 mL to 5 L. Volumetric gradations are applied using