Porcelain Büchner Funnel

Vacuum Filtration Funnel for Efficient Solid–Liquid Separation

Product Overview

The porcelain Büchner funnel is a laboratory filtration device designed for vacuum-assisted solid–liquid separation. It consists of a rigid porcelain body with an integrated perforated plate that supports filter paper during filtration.

Compared with gravity filtration, the Büchner funnel significantly improves filtration speed and efficiency by using vacuum pressure to draw liquid through the filter medium while retaining solid particles on the

It is widely used in chemical laboratories, pharmaceutical research, environmental testing, and analytical workflows such as recrystallization, precipitate collection, and gravimetric analysis.

Working Principle

The Büchner funnel operates as part of a vacuum filtration system. A filter paper is placed on the perforated plate, and the liquid sample is poured into the funnel.

When connected to a vacuum source, negative pressure pulls the liquid through the filter paper and perforated plate, while solid particles remain on the filter surface for collection and further analysis.

This process enables rapid separation and improved recovery of fine particles compared to traditional gravity filtration methods.

Product Structure

• Porcelain funnel body with cylindrical walls
• Integrated perforated filtration plate
• Straight or tapered stem for vacuum connection
• Glazed inner and outer surface (except rim)

Key Features

• Chemical-resistant porcelain suitable for acids and alkalis
• High thermal stability and resistance to thermal shock
• Rigid structure for repeated laboratory use
• Fixed perforated plate ensures uniform filtration
• Compatible with standard filter paper sizes
• Designed for vacuum filtration systems

Technical Specifications

Applications

• Vacuum filtration of chemical solutions
• Precipitate collection and purification
• Recrystallization workflows
• Gravimetric analysis
• Environmental and water sample preparation
• Pharmaceutical laboratory filtration

Advantages Over Gravity Filtration

• Faster filtration speed under vacuum pressure
• Improved solid recovery efficiency
• Better handling of fine or dense particles
• Reduced processing time in laboratory workflows

Büchner Funnel vs Other Filtration Devices

Büchner Funnel vs Standard Filter Funnel

• Uses vacuum instead of gravity
• Higher filtration efficiency
• Better for fine particle separation

Büchner Funnel vs Membrane Filtration Unit

• Büchner funnel is reusable and method-based
• Membrane filtration units are disposable systems
• MF units focus on microbial detection, while Büchner funnels focus on general filtration

Available Sizes

Multiple diameters are available to match different filtration volumes and filter paper sizes, ranging from small-scale analytical applications to large-volume laboratory filtration.

Ordering Information

Frequently Asked Questions

What is a Büchner funnel used for?

It is used for vacuum filtration to separate solid particles from liquids efficiently in laboratory workflows.

Why use a Büchner funnel instead of gravity filtration?

Vacuum filtration significantly increases filtration speed and improves separation efficiency, especially for fine particles.

Is the porcelain Büchner funnel reusable?

Yes. It is designed for repeated use with proper cleaning and handling.

What filter paper should be used?

Standard qualitative or quantitative filter paper matching the funnel diameter is typically used.