Glass Funnel

conical

length 60mm

It is used with Filter paper 125mm.

Available in:

60mm
75mm
90mm

When used with filter paper, filter funnels, Büchner and Hirsch funnels can be used to remove fine particles from a liquid in a process called filtration. For more demanding applications, the filter paper in the latter two may be replaced with a sintered glass frit. Separatory funnels are used in liquid-liquid extractions. The Tullgren funnel is used to collect arthropods from plant litter or similar material.[2]

Construction
Glass is the material of choice for laboratory applications due to its inertness compared with metals or plastics. However, plastic funnels made of nonreactive polyethylene are used for transferring aqueous solutions. Plastic is most often used for powder funnels that do not come into contact with solvent in normal use.

Uses
To channel liquids or fine-grained substances into containers with a small opening. Used for pouring liquids or powder through a small opening and for holding the filter paper in filtration. Used in transferring liquids in small containers.

Πηγή: https://en.wikipedia.org/wiki/Laboratory_funnel