Eisco Dropping Funnels with Screw Type Needle Valve PTFE Rotaflow Stopcocks

Dropping Funnels with PTFE Rotaflow needle valve stopcocks and sockets fitted with interchangeable plastic stoppers.

• Cylindrical ungraduated glass dropping funnel
• Fitted with an interchangeable plastic stopper and screw type needle valve PTFE Rotaflow stopcock for more precise drop control
• Made of durable, high quality borosilicate 3.3 glass which withstands high temperatures and thermal shocks
• Used for extractions or to dispense liquids into a system slowly (drop-wise)

Autoclavable, with superior chemical durability. Low temperature gradient - can withstand high temperatures and thermal shocks.

Eisco Labs Borosilicate glass has the following heat tolerances:
- Strain Point 515 °C
- Annealing Point 565 °C
- Softening Point 820 °C