Single Cone, Plain End - Cone Size: 12/21 - 4.6" Long Shank - Borosilicate Glass - Eisco Labs

• Single cone made of high quality, heavy duty 3.3 borosilicate glass
• Cone size: 12/21
• 4.6" long
• Plain end- inner diameter measures 6mm, outer diameter measures 10mm

Single 12/21 cone made of high quality, heavy duty 3.3 borosilicate glass. Plain end, with an inner diameter of 6mm, and an outer diameter measuring 10mm. 4.6" long. Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C