Hollow Stopper, Hexagonal - 12/21 Cone - Round End - Borosilicate Glass - Eisco Labs

• Hollow stopper made of high quality, heavy duty, 3.3 borosilicate glass
• Hexagonal top and Round End
• 12/21 cone size
• Perfect for any science or home laboratory

Hollow stopper made of high quality, 3.3 borosilicate glass. Stopper features a hexagonal shaped top and a round end. 12/21 cone size.

Stopper measures 1.55" in total length. Top measures 0.6" long and wide.
Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C.