Filtering Funnels
Filtering funnels hold filter media while liquid passes through it. McQueen Labs offers Nalgene reusable analytical funnels, two-piece polypropylene Büchner funnels, reusable bottle-top filters, a reusable filter funnel with clamp, and single-use analytical filter funnels.
Compare the application, capacity, filter requirements, and connection to your filtering flask or manifold. Nalgene Reusable Analytical Funnels offer an autoclavable polysulfone option. Nalgene Single Use Analytical Filter Funnels are sterile disposable units for microbiological quality-control testing of water, food and beverages, raw materials, and finished products.
Frequently Asked Questions
How do I choose between reusable and single-use filtering funnels?
Choose a reusable funnel when your workflow calls for equipment that can be cleaned and reused; choose a single-use format when it calls for a sterile disposable unit. Nalgene Reusable Analytical Funnels are autoclavable, while Nalgene Single Use Analytical Filter Funnels are preassembled, sterile, individually bagged, and intended for one use only.
Which membrane sizes do the analytical funnels use?
Nalgene Reusable Analytical Funnels accept 47 or 50 mm diameter membranes; their included-components list specifies a support plate for a 47 mm membrane. Confirm support requirements when choosing a 50 mm membrane. Nalgene Single Use Analytical Filter Funnels contain a 47 mm cellulose nitrate membrane. Check membrane diameter and pore size separately.
Will a reusable analytical funnel fit my filtering flask or manifold?
Nalgene Reusable Analytical Funnels are specified for filtering flasks or vacuum manifolds that accept a suitable rubber stopper with a hole. Check the stopper size, hole dimensions, and supplied vacuum gasket against your equipment before ordering.
Can the polypropylene Büchner funnels be autoclaved?
Yes. Nalgene Büchner Two-Piece Polypropylene Funnels are listed as autoclavable to 135°C (275°F). The cup and funnel separate for cleaning. These specifications apply to this product family, rather than every filtering funnel in the category.
What is included with the single-use analytical filter funnels?
The Nalgene Single Use Analytical Filter Funnels product page lists six funnel adapters with each case. It also specifies a 47 mm cellulose nitrate membrane. Check the selected capacity, pore size, membrane color, and unit size before ordering.