Designed for nitrogen determination as per Kjeldahl method Made of high quality Borosilicate glass 100mL capacity Long neck, round bottom Conforms to DIN ISO 12360 standard Kjeldahl Flask has a long neck, round bottom, and is made from industrial quality borosilicate 3.3 glass. Designed for nitrogen determination as per Kjeldahl method. Conforms to DIN ISO 12360 standard. Flask measures 9.5" tall. 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. Eisco 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.