5,000ml capacity boiling flask made from high quality, heavy duty Borosilicate 3.3 glass. Round bottom for more uniform boiling and heating of liquids. Flask features a narrow neck measuring 4 in total length, and a beaded rim. The inner diameter of the flask neck measures 1.75 (45mm) and it's outer diameter measures 2.2 (55mm). Flask stands 13 tall and is 9 in diameter at it's widest point.As per DIN ISO 1773 standard. 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°CEisco Labs proudly manufactures its own products using state-of-the-art equipment, and following the highest standards of quality control. 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. INDUSTRIAL QUALITY || 5000ml Boiling Flask made of high quality, heavy duty, Borosilicate 3.3 glass. Autoclavable, with superior chemical durability. Low temperature gradient- can withstand high temperatures & thermal shocks NARROW NECK || Flask features a narrow neck. Neck measures 4 in total length and has an inner diameter of 1.75 (45mm) and an outer diameter of 2.2 (55mm) 13 INCHES TALL || Flask stands 13 tall and is 9 in diameter at it's widest point ROUND BOTTOM || Flask features a spherical base for uniform heating and boiling of contents GREAT FOR PROFESSIONAL LABORATORIES, CLASSROOMS & HOUSEHOLD || Designed for use in professional laboratories, but is an ideal choice for science classrooms and household use Capacity 5000 Milliliters Brand Name EISCO Item Weight 2.8 Pounds Part Number CH0402J Bottom Shape Round Manufacturer Eisco Model Number CH0402J Material Type Borosilicate Glass Specification Met Iso Item Dimensions D x W x H 2.2 D x 2.2 W x 13 H