United Scientific? Fg5340-1000 Laboratory Grade Borosilicate Glass Heavy Wall These heavy wall filtering flasks are designed with heavy-duty rims and bolt necks with tubulation. 1) Borosilicate glass , 2) Graduations printed in durable white enamel , 3) Temperature range: -50C (-58F) up to 500C (932F), 4) Dimensions: 138mm Dia. x 245mm Hgt., 5) Tubing size: 3/8" Capacity: 1000mL (1L), Tubing size: 3/8" Graduation Range: 400-1000mL, Graduation Intervals: 50mL Made from industrial quality Borosilicate 3.3 glass, these flasks are built to withstand high temperatures and thermal shock. These flasks feature dual scale graduations per ASTM-E960 standards. All United Scientific flasks are dishwasher safe. Every United Scientific flask is manufactured using state of the art equipment. Every product undergoes various rounds of quality control, and is designed to ensure a smooth, consistent experience for our customers. Dimensions: 138mm Dia. x 245mm Hgt.