Rimless Thick Wall Borosilicate Glass Test Tube, 100-Pack

This set of 100 rimless test tubes is made from heavy-duty borosilicate 3.3 glass with 5mL capacity. Tubes feature fire-polished flat edges with uniform 1mm walls. Each tube measures 3 inches (75mm) tall with a 0.5-inch (12mm) outer diameter and 11mm inner diameter. Accommodates stoppers with 9-10mm bottom diameter and 13-15mm top diameter. Autoclavable with superior chemical durability and thermal shock resistance. Can withstand direct flame, high temperatures, and thermal shocks. Heat tolerances include a Strain Point of 515°C, Annealing Point of 565°C, and Softening Point of 820°C. Suitable for culture testing in professional laboratories and science classrooms.