This 100 ml round-bottom evaporating flask is made from Borosilicate 3.3 glass and features a single interchangeable joint with a 24/29 size socket. No stopper is included. The flask stands 4.25 inches tall and is 2.5 inches in diameter at its widest point. The borosilicate glass construction is autoclavable with superior chemical durability and can withstand high temperatures and thermal shocks. Heat tolerances are: Strain Point 515°C, Annealing Point 565°C, and Softening Point 820°C.