Lab funnels direct liquids or powders into bottles, cylinders, flasks, and other containers with narrow openings. They're typically cone-shaped with a wide mouth to take in materials and a slim stem to channel materials into a container. This design helps avoid spills and material loss. Laboratory funnels are used for applications such as separating solid particles from liquids, dividing liquid mixtures, and transferring liquids, powders, and semi-solids.
The short stem on these funnels minimizes chance of clogging when transferring powders and solids.
Efficiently transfer liquid into containers with narrow openings using these long-stemmed funnels.
Stainless Steel Funnels
Liquid flows smoothly through these durable, corrosion-resistant stainless steel funnels, which have vented stems to prevent air lock.
Also known as Urbanti funnels, these funnels have internal spiral ribs that speed up non-vacuum filtration processes. Vertical ribs on the outer surface of the stem prevent air lock, allowing liquids to flow smoothly through the funnel.
Vacuum Filtering Funnels
Straight-sided filtering funnels, also known as Buchner funnels, are ideal for separating particles from liquids in fast-flow, pressure-assisted filtering applications. Place a filter paper on the funnel's perforated plate and create a vacuum in the flask below the funnel to pull the liquid through the filter.
An anti-splash ring keeps liquids from spilling over the funnel's rim as they're poured into the funnel. An attached mesh screen filters particles.
Covered Funnels for Hazardous Waste
Close the cover on these funnels to minimize spilling if the funnel is tipped and to prevent potentially dangerous fumes from escaping out of the funnel. Commonly known as safety waste funnels, these funnels can be left attached to a waste container when collecting lab waste or hazardous materials in the container.
Sediment Settling Cones
Measure quantities of sand and settled matter in water, sewage, and other liquids using these cones, which are also known as Imhoff cones. After the liquid has rested in the cone, the heavier material will settle at the bottom. Graduated markings on the side of the cone let you measure the settled contents quickly.
Pear-shaped separatory funnels (also called separation funnels) are used to divide a liquid mixture in a process known as liquid-liquid extraction. The liquids eventually settle into two layers, with the denser liquid on the bottom. Open the stopcock valve at the bottom of the funnel to allow the denser liquid to flow out, separating the liquids.