Glass Stopcocks with Ground Cone

Fits glass aspirator bottles with matching joints.

• Stopcocks made of high quality, heavy duty, 3.3 borosilicate glass
• Standard ground joints
• PTFE key for controling flow
• Autoclavable
• Superior chemical resistance and durability - can withstand high temperatures and thermal shocks

For use with glass aspirator bottles with compatible joint. Low temperature gradient can withstand high temperatures and thermal shocks.

Borosilicate glass has the following heat tolerances: strain point 515 °C, annealing point 565 °C, softening point 820 °C.