Rimmed Borosilicate Glass Test Tube, 20 x 150mm (5.90" Height) 32-Pack

Set of 32 test tubes made of high quality Borosilicate 3.3 Glass. 30ml capacity. Tubes feature uniform, 1.2mm walls and beaded rims.<br>Each tube measures 5.9" (150mm) tall, with an outer diameter of 0.8" (20mm). Inner diameter measures 18.8mm. Accommodates stoppers with a bottom diameter of 15-16mm & top diameter of 20-24mm. (Compatible stoppers can be found by searching ASIN: B07CZ3DV4P and B013TMXM0A).<br><br>Autoclavable, with superior chemical durability. Low temperature gradient- can withstand direct flame, 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.<br><br><b>Eisco Labs proudly manufactures its own products using state-of-the-art equipment, and following the highest standards of quality control.</b><br>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.