Rapid CH0718D Test Tubes, Medium Wall, Cap. Range - Rapid CH0718G, Rapid CH0718G Test Tubes, medium wall, cap. 50ml, 150x24mm, boro. Glass c/w Rim Set of 100 test tubes made of high quality Borosilicate 3.3 Glass. 50ml capacity. Tubes feature uniform, 1.2mm walls and beaded rims. Each tube measures 5.9" (150mm) tall, with an outer diameter of 0.95" (24mm). Inner diameter measures 22.8mm. Accommodates stoppers with a bottom diameter of 20-21mm & top diameter of 24-26mm. 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 CH0718G Test Tubes, medium wall, cap. 50ml, 150x24mm, boro. Glass c/w Rim