Whatman® qualitative filter paper, Grade 4, Circles

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Pore Size: 20-25 μm (Particle retention)

Diameter

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Specifications:

Application	Filtration, Analytical Chemistry
Max Speed	37 sec/100 mL speed (Herzberg)
Storage Temperature	Ambient
Product Type	Filter Papers
Product Brand	Whatman™, Cytiva

Overview
Resource

The Whatman™ Grade 4 Qualitative Filter Papers are high-performance cellulose filter papers designed for fast filtration and coarse particle retention in routine laboratory applications. Known for their exceptionally high flow rate, these filters are ideal when rapid processing is required and fine particle retention is not critical.

With a nominal particle retention of 20–25 µm, Grade 4 filter papers are particularly suited for filtering coarse precipitates and gelatinous materials, making them a preferred choice for analytical, environmental, and industrial workflows.

Key Features

Extremely High Flow Rate

One of the fastest qualitative filter papers available
Enables rapid filtration and increased laboratory throughput
Ideal for time-sensitive workflows

Coarse Particle Retention

Nominal retention of 20–25 µm
Efficiently captures:
- Coarse particles
- Gelatinous precipitates
Suitable for applications where fine filtration is not required

Versatile Cellulose Composition

Made from high-quality cellulose fibers
Ensures consistent filtration performance
Compatible with a wide range of chemical and biological samples

Excellent for Routine Laboratory Use

Ideal for quick clarification and separation tasks
Suitable for general qualitative analysis

Flexible Format Options

Available in circular, sheet, roll, and prepleated formats
Prepleated versions provide:
- Faster flow rates
- Increased loading capacity

Applications

Fast filtration of coarse precipitates
Filtration of ferric hydroxide and aluminum hydroxide
Routine laboratory sample clarification
Cleanup of biological fluids and organic extracts
Environmental monitoring (air and particulate analysis)
Qualitative analytical separations
Industrial and research laboratory filtration

Technical Specifications

Parameter	Specification
Product Type	Qualitative Filter Paper
Grade	Whatman Grade 4
Material	Cellulose
Particle Retention	20–25 µm
Filtration Speed	Very fast
Format	Circles / Sheets / Rolls / Prepleated
Application	Coarse filtration and rapid separation
Pack Size	Typically 100 sheets (varies by model)

Available Models and Ordering Information (Selected)

Catalog Number	Diameter	Format	Pack Size
1004-027	27 mm	Circles	400/pk
1004-041	41 mm	Circles	100/pk
1004-042	42.5 mm	Circles	100/pk
1004-047	47 mm	Circles	100/pk
1004-050	50 mm	Circles	100/pk
1004-055	55 mm	Circles	100/pk
1004-070	70 mm	Circles	100/pk
1004-090	90 mm	Circles	100/pk
1004-110	110 mm	Circles	100/pk
1004-125	125 mm	Circles	100/pk
1004-150	150 mm	Circles	100/pk
1004-185	185 mm	Circles	100/pk
1004-240	240 mm	Circles	100/pk
1004-270	270 mm	Circles	100/pk
1004-320	320 mm	Circles	100/pk
1004-400	400 mm	Circles	100/pk

Workflow Integration

Sample Preparation → Rapid Filtration (Grade 4) → Filtrate Collection → Analysis

This ensures:

Fast separation of coarse materials
Efficient processing of large sample volumes
Improved laboratory productivity

Unique Advantages

Extremely fast filtration speed for high-throughput workflows
Ideal for coarse and gelatinous precipitate filtration
Reduces processing time in routine laboratory applications
Available in multiple sizes and formats for flexibility
Compatible with a wide range of analytical and industrial processes
Trusted Whatman™ quality for consistent results

The Whatman™ Grade 4 Qualitative Filter Papers are the ideal solution for laboratories requiring rapid filtration and efficient handling of coarse particles. With their high flow rate, robust performance, and versatility, they are an essential consumable for routine filtration, environmental analysis, and industrial applications where speed and efficiency are critical.