A Separating Funnel (also known as a Separatory Funnel) made from Pyrex glass is commonly used in laboratory settings for liquid-liquid extraction, where two immiscible liquids (often an organic solvent and water) need to be separated. Pyrex is a brand of borosilicate glass known for its high resistance to heat and chemicals, making it ideal for use in laboratory applications.
Here are the typical specifications for a Pyrex Separating Funnel:
1. Material:
- Pyrex (Borosilicate glass): Resistant to thermal shock, high temperatures, and most chemicals.
2. Volume:
- Common Sizes: 125ml, 250 mL, 500 mL, 1000 mL, 2000 mL, 5000 mL
- Larger volumes are typically available for specific laboratory needs.
3. Design:
- Shape: Conical or pear-shaped (for ease of separation and pouring)
- Stopcock: Typically made of Glass or Plastic, which is chemical-resistant and allows easy control of liquid flow. The stopcock is positioned at the bottom of the funnel.
- Neck: Usually cylindrical, allowing attachment of a stopper, clamps, or other connectors.
4. Graduations:
- Some Pyrex separating funnels are graduated for easy volume measurement, although they may not be as precise as volumetric glassware.
5. Stopcock Size:
- Typically 3-4 mm diameter for small funnels, and 6-8 mm for larger funnels, allowing for adequate liquid flow control.
6. Inlet/Outlet:
- Top Opening: For adding liquids or attaching a stopper.
- Stopcock: At the bottom for draining and separating liquids.
7. Tolerance:
- As a general laboratory product, the tolerances for Pyrex glassware are usually ±5% for volume measurement.
8. Temperature Resistance:
- Maximum Temperature: Can generally withstand temperatures up to 300°C (for brief periods).
9. Standard Features:
- Easy-to-read scale: If graduated, measurements are often in milliliters.
- Tapered design: Ensures easier separation of immiscible liquids.
- Wide mouth opening: To easily add and mix solvents.
10. Cleaning and Maintenance:
- Pyrex glass is easy to clean and can be used with most laboratory cleaning agents.
