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SKU 250CERFUNN
USA Lab
250MM Ceramic Buchner Funnel
$120.00
In stockGlazed ceramic Buchner filtration funnel in the 250 mm size, the largest in this range, with a flat perforated filter plate and a tapered stem for a stoppered filter flask. Intended for batch volumes where a 150 mm or 200 mm plate would need repeated paper changes. The listing covers the funnel alone.
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Description
A 250 mm Buchner filtration funnel in glazed ceramic, the largest of the three sizes in this range (150 mm, 200 mm, 250 mm). The flat perforated plate supports a filter paper disc, vacuum applied to the receiving flask draws the filtrate through, and the tapered stem seats into a stopper or filter-flask adapter.
At this diameter the funnel is a substantial piece of ceramic. Support the funnel and check that the receiving flask, stopper and any stand can carry the loaded weight before pulling vacuum.
Specification
- Nominal size: 250 mm
- Construction: glazed ceramic throughout, including the perforated filter plate
- Outlet: plain tapered stem, no ground-glass joint
- SKU: 250CERFUNN
Filter paper, stoppers, adapters and the receiving flask are not part of this SKU.
Frequently asked questions
What size filter paper does the 250 mm funnel take?+
Size the paper to the perforated plate rather than to the 250 mm funnel designation. The plate is smaller than the outside diameter of the body, so measure it before ordering discs in quantity.
What is supplied with the funnel?+
SKU 250CERFUNN covers the ceramic funnel on its own. Filter paper, stoppers, adapters and the receiving flask are not listed as part of it.
What is it made of?+
Glazed ceramic throughout, including the perforated filter plate. There is no sintered glass frit and no elastomer seal in the funnel itself.
Does it need supporting?+
At 250 mm the funnel plus a wet filter cake is a meaningful load on the flask neck. Support the funnel independently, or confirm that your filter flask, stopper and stand are rated to carry it, before applying vacuum.
How does it attach to a filter flask?+
Through a plain tapered stem seated in a stopper or a filter-flask adapter matched to your flask neck. There is no ground-glass joint on this funnel.
