Glass funnel Schott Zwiesel Pure lejek, laboratory glassware by Schott Zwiesel

Pure lejek by Schott Zwiesel is a laboratory glass funnel designed for controlled liquid transfer and simple filtration tasks. Made from clear laboratory-grade glass by Schott Zwiesel, the funnel provides a smooth, inert surface suitable for handling aqueous solutions, solvents compatible with glass, and routine sample preparation. Its straightforward geometry and transparent body allow for visible flow and easy alignment when pouring into bottles, flasks, or other receiving vessels.

Advantages

The funnel is manufactured from chemically resistant, laboratory-grade glass that does not interact with most common reagents, ensuring sample integrity during transfer. Its clear construction provides good visibility of liquids and particulates, while the smooth internal surface reduces retention of residues and simplifies cleaning. The simple, robust design makes the funnel suitable for repeated use in teaching labs and light research settings where durable, easy-to-maintain glassware is preferred.

Suitable for

• Controlled pouring of liquids into narrow-neck bottles and flasks
• Basic gravity filtration with appropriate filter paper
• Sample preparation and transfer in educational laboratories
• General liquid handling in research or quality control tasks that require inert glassware

Key specifications

• Material: clear laboratory-grade glass
• Design: conical funnel shape for guided liquid flow
• Surface: smooth, non-porous glass interior
• Chemical compatibility: compatible with water and many common laboratory solvents that do not attack glass
• Visibility: transparent body for monitoring liquid transfer

How to use

Rinse the funnel with an appropriate solvent or deionized water before first use and between different samples to avoid cross-contamination. Place the funnel securely in the receiving vessel or in a suitable ring clamp if needed. For filtration, insert appropriately sized filter paper so that it fits the funnel walls without gaps; pour liquids slowly to maintain a stable flow and avoid overflow. After use, rinse thoroughly and clean following your laboratory's glassware cleaning procedures and drying protocols.

Usage recommendations

Use the funnel with compatible chemicals and avoid strong hydrofluoric acid and other agents known to etch or dissolve glass. Handle with care to prevent chips or cracks; inspect before each use and do not use if damaged. Store in a dry, stable location to minimize risk of mechanical damage and contamination.