Safety Emporium for all your lab and safety needs
Safety Emporium for all your lab and safety needs

*The Glassware Gallery*

Fritted Funnels



Click on any frit or adapter for more information or to order

Fritted glass Buchner Funnel
Büchner funnel
glass frit
Jacketed filter funnel
Jacketed Filter Funnel
Filter funnel
Büchner funnel w/
inner joint
Vacuum adapter
Vacuum Filtration Adapter
Filter funnel
Büchner funnel, inner
joint, improved
Filter Tube
Quick separation
Filter Adapter
Filter adapter w/
drip tube


General tips

  • If you are filtering to remove a very fine precipitate and don't want material to clog the pores of your frit, you should first layer a pad of Celite (also known as diatomaceous earth or Kieselguhr ) on the frit. Wet the pad with your solvent and then filter your solution, taking care not to disturb the Celite layer. If your filtration slows down or stops you can simply stir the topmost layer of the Celite pad.
  • Avoid filtering charcoal solutions on a frit unless you are using a thick Celite pad. Carbon does not clean out of your frit using acid, base or solvents and can only be removed by heating the frit in a furnace at 480 degrees C in an oxidizing atmosphere. That's a lot of work unless you have a special oven for cleaning glassware. Thermo Scientific sells Pyro-Clean® controlled atmosphere ovens which appear to be a convenient way to remove otherwise intractable organic residues from all sorts of glassware, including frits.
  • If you clean your frit as soon as you are done with your experiment it will be MUCH easier to clean.
  • If you are using your frit to collect a product, be careful not to scrape the frit too hard with your spatula. This can damage the frit as well as contaminate your product with small glass particles.
  • Never soak your frit in a base bath (see below).
book cover

Purification of Laboratory Chemicals is one of many books and pamphlets you'll find at Safety Emporium.

Cleaning frits


This page was last updated Friday, October 22, 2010.
This document and associated figures are copyright 1996-2015 by Rob Toreki. Send comments, kudos and suggestions to us via email.