Penny Head Solid Cone Stopper, 10/19, Borosilicate Glass

This solid cone stopper is made from Borosilicate 3.3 glass with a flat penny head design and a 10/19 joint size. The penny head provides a convenient grip surface for insertion and removal, while the solid cone ensures an airtight seal. The stopper stands 1.1 inches tall. Borosilicate glass construction is autoclavable and offers superior chemical durability. Heat tolerances are: Strain Point 515°C, Annealing Point 565°C, and Softening Point 820°C. Suitable for use with compatible glassware in professional and educational laboratories.