Funnels Long Stem

During filtration, air can become trapped between the funnel cone and the receiving vessel, creating an air lock that stops or slows liquid flow. The external ribs on the funnel cone create small channels that allow this trapped air to escape, ensuring continuous, uninterrupted liquid flow through the filter paper and stem. This simple but effective feature eliminates a common frustration in laboratory filtration.

The 60° cone angle is the industry standard for laboratory funnels. It is specifically designed to match the angle of standard filter paper cones when folded properly, ensuring optimal fit and maximum filtration efficiency. This angle provides the ideal balance between filtration speed and filter paper support, preventing tearing while maintaining good flow rates.

These long stem funnels are available in two sizes: 100 ml capacity (Code 57104) supplied in economical packs of 36 pieces, and 150 ml capacity (Code 57107) supplied in packs of 12 pieces. The 100 ml size is ideal for small-volume work and high-use environments like teaching labs, while the 150 ml size suits routine laboratory applications.

Yes, these funnels are manufactured from polypropylene and can be steam autoclaved at standard sterilization temperatures (121°C). This makes them suitable for sterile applications in microbiology, cell culture, and pharmaceutical settings. They can be autoclaved repeatedly without degradation, though like all plastics, repeated cycles may eventually affect the material over time.

Polypropylene offers excellent chemical resistance to aqueous solutions, dilute acids, dilute bases, alcohols, and many organic solvents including acetone, ethanol, and methanol. However, it may not be suitable for strong oxidizing agents, concentrated acids, chlorinated solvents (like chloroform or dichloromethane), or aromatic hydrocarbons (like toluene or xylene). Always consult chemical compatibility charts for specific applications.

Yes, these funnels are manufactured from polypropylene material conforming to US FDA 21CFR standards, making them suitable for direct food contact applications. This compliance ensures they meet strict safety requirements for food processing, pharmaceutical, and clinical laboratory use.

Cleaning is simple due to the smooth walls: rinse immediately after use with an appropriate solvent (water for aqueous materials, compatible solvent for organic residues). For thorough cleaning, wash with warm water and mild laboratory detergent using a soft brush if needed. Rinse thoroughly with distilled water. The funnels can also be autoclaved for sterilization. The smooth interior prevents residue buildup and makes cleaning quick and effective.

Polypropylene has good resistance to many organic solvents including alcohols and acetone, which are commonly used in laboratories. However, for aggressive solvents like chlorinated hydrocarbons (chloroform, dichloromethane) or aromatic solvents (toluene, xylene), compatibility should be verified. For routine use with common solvents, these funnels are suitable.

Long stem funnels, like these, have an extended stem that reaches into the receiving vessel, making them ideal for transferring liquids into narrow-necked containers and for hands-free operation. Short stem funnels are better suited for general pouring into wide-mouthed vessels and for applications where the stem might interfere with the receiving container. Long stem funnels are preferred for quantitative work and filtrations into volumetric glassware.