Rapid CH0718D Test Tubes, Medium Wall, Cap. Range - Rapid CH0718N, Rapid CH0718N Test Tubes, medium wall, cap. 15ml, 125x16mm, boro. Glass w/o Rim Pack of 100 rimless Test Tubes made of high quality borosilicate 3.3 Glass. 15mL capacity. Tubes feature fire polished flat edges with uniform, 1.2mm walls. Each tube measures 125mm (5") tall with an outer diameter of 16mm (0.6"). Autoclavable, with superior chemical durability. Low temperature gradient- can withstand direct flame, high temperatures & thermal shocks. Borosilicate glass has the following heat tolerances: Strain Point 515°C | Annealing Point 565°C | Softening Point 820°C. Rapid CH0718N Test Tubes med wall cap 15ml 125x16mm boro. Glass w/o Rim pk 100