Specifications

Dimensions below are the standard production range for porcelain Buchner funnels. Sizes are given as a selection hint only; please check the actual product.

Request custom specs

Porcelain Buchner funnel sizes

Nominal dia. (mm)	Top dia. (mm)	Overall height (mm)	Plate pore (μm)	Filter flask (mL)
60	60	85	≈15	250
80	80	100	≈15	250
100	100	115	≈20	500
120	120	130	≈20	500
150	150	150	≈25	1000
200	200	175	≈25	2000
300	300	230	≈30	5000

Values are typical; reasonable tolerances apply between production batches. Please rely on actual measurement.

📌 Customization:
• Complete sets with rubber stopper or gasket and filter flask available
• Plain porcelain funnels without a filter plate available as an alternative
• Bulk orders support specified sizes and packaging

Product Description

1. Overview

The porcelain Buchner funnel consists of a wide-mouthed cone and an integrated perforated porcelain plate. Combined with a filter flask and a vacuum pump, it creates negative pressure inside the flask to filter quickly. Compared with gravity filtration it is markedly faster, which helps with fine, hard-to-filter precipitates.

Formed in one piece from hard porcelain, the filter plate has even pores and a flat surface so the filter paper seats tightly and leakage caused by torn paper is avoided. The porcelain body is chemically stable and tolerates common acid, alkali and organic media, with the exception of hydrofluoric acid and hot alkali fusion.

Standard diameters run from 60mm to 300mm. Small sizes suit micro samples and teaching demonstrations, while large sizes handle batch samples and scale-up solid-liquid separation. Match the funnel with a filter flask of suitable capacity, using a rubber stopper or gasket where needed for a tight seal.

🔬 Types & Features:
One piece — plate and body fired together, firmly bonded.
Perforated plate — even pores keep the filter paper flat.
Acid, alkali and heat resistant — repeated rinsing and oven drying.
Full size range — 60mm to 300mm, from micro to batch work.

2. Key Parameters

Material: hard porcelain (glazed inside and out)
Sizes: diameter 60 / 80 / 100 / 120 / 150 / 200 / 300 mm
Filter plate: integrated perforated porcelain plate
Corrosion: resists common acids and alkalis; not for HF or alkali fusion
Accessories: filter flask, vacuum pump, filter paper
Applications: vacuum filtration, crystal washing, precipitate collection

3. Material & Workmanship

The funnel is formed in one piece from quality ceramic material and fired at high temperature, so the plate and body are bonded firmly and resist deformation. Plate pores are controlled uniformly, letting the filter paper seat flat and seal reliably.

Handling tip: rinse and dry the funnel before first use; if the plate clogs, soak it in dilute acid and flush with clean water.

Applications

Typical Uses

Vacuum filtration

faster separation of hard-to-filter precipitates

Crystal washing

repeated rinsing with a little cold solvent under vacuum

Precipitate collection

gathering and drying solids in quantitative analysis

Decolourising filtration

removing activated carbon after treatment

Industries

Chemical analysis routine preparation of inorganic and organic samples
Pharmaceutical crystallisation and washing of active ingredients
Food testing clarifying sample extracts
Environmental monitoring collecting suspended solids from water
Teaching laboratories vacuum filtration demonstrations

Selection Guide

Select by volume per batch

Volume per run	Suggested diameter	Typical use
Under 10 mL	60mm	Teaching demos, micro precipitates
10 ~ 50 mL	80 ~ 100mm	Routine analysis, single sample
50 ~ 200 mL	120 ~ 150mm	Batch samples, crystal washing
Over 200 mL	200 ~ 300mm	Pilot work, batch production

💡 Tips: Filter paper size — slightly smaller than the plate so the rim seals.
Flask neck — must match the funnel stem; use a rubber stopper if needed.
Plate pore size — finer solids call for smaller pores to avoid leakage.
Spares — keep two or three of each size for continuous work.

Operation & Maintenance

Operation Guide

The porcelain Buchner funnel is used with a filter flask and a vacuum pump or water aspirator. The steps below describe routine vacuum filtration; adjust parameters to suit your sample.

Before Use

Check the funnel and plate for cracks or chips
Cut a filter paper slightly smaller than the plate
Wet the paper with a little solvent and press it flat onto the plate
Connect the funnel stem to the filter flask, adding a stopper if needed
Confirm all connections are secure before starting the pump

Procedure

Seat the wetted paper flat on the plate and apply slight vacuum to hold it
Pour the liquid in slowly, keeping the level below two thirds of the funnel depth
Maintain steady vacuum and top up the liquid as the level falls
Reduce vacuum as the liquid nears the plate so the cake is not compacted
Release the vacuum before switching off the pump to prevent suck-back
Rinse the cake two or three times with a little cold solvent and draw dry
Remove the paper and solids, then dry or ignite as required

Cleaning & Care

Rinse promptly after use to remove residual solids
Soak a clogged plate in dilute acid or alkali, then back-flush with water
Use a soft brush if needed; never scrape the plate with hard tools
Air dry or oven dry at low temperature, avoiding thermal shock
Store in a dry place away from hard objects

💡 Lab veteran tips: Wet before filtering — the paper seals better and edge leakage drops.
Watch the level — an overfilled funnel can wash the paper aside.
Vacuum off first, then the pump — this avoids suck-back.
Slow solids — pour smaller portions and filter in stages.

Care & Notes

Show care & notes

⚠️ Safety Notes

Vacuum

use a thick-walled filter flask and a shield where appropriate

Suck-back

fit an anti-suck-back trap and release vacuum before stopping the pump

Media limits

not suitable for hydrofluoric acid or hot alkali fusion

Hot ware

let ignited items cool before handling, and use tongs

Do not

Fragile ware: avoid knocks in handling; stop using any cracked piece

Porcelain Buchner Funnel

Specifications

Porcelain Buchner funnel sizes

Product Description

1. Overview

2. Key Parameters

3. Material & Workmanship

Applications

Vacuum filtration

Crystal washing

Precipitate collection

Decolourising filtration

Selection Guide

Select by volume per batch

Operation Guide

Before Use

Procedure

Cleaning & Care

Care & Notes

Vacuum

Suck-back

Media limits

Hot ware

Need Porcelain Buchner Funnel?

Porcelain Buchner Funnel

Specifications

Porcelain Buchner funnel sizes

Product Description

1. Overview

2. Key Parameters

3. Material & Workmanship

Applications

Vacuum filtration

Crystal washing

Precipitate collection

Decolourising filtration

Selection Guide

Select by volume per batch

Operation Guide

Before Use

Procedure

Cleaning & Care

Care & Notes

Vacuum

Suck-back

Media limits

Hot ware

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