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Whatman® Qualitative Filter Paper, Grade 1 Circles
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Pore size: 11 μm (Particle retention)
Specifications:
| Application | Filtration |
| Max Speed | 150 sec/100 mL speed (Herzberg) |
| Storage Temperature | Ambient |
| Product Type | Filter Papers |
| Product Brand | Whatman™, Cytiva |
| Product Grade | Laboratory grade |
The Whatman™ Grade 1 Qualitative Filter Papers are the most widely used standard-grade filter papers for routine laboratory filtration and qualitative analytical applications. Manufactured from high-quality cellulose, these filter papers provide medium flow rate and reliable particle retention (~11 µm), making them ideal for a broad range of laboratory, industrial, and environmental applications.
Designed for versatility and consistency, Grade 1 filter papers are suitable for clarifying liquids, separating precipitates, and general-purpose filtration, delivering dependable performance across diverse workflows.
Key Features
Industry-Standard Filter Paper
- The most commonly used qualitative filter paper worldwide
- Trusted for routine laboratory and analytical applications
Medium Flow Rate & Particle Retention
- ~11 µm particle retention for effective filtration
- Balanced performance between flow speed and retention
- Suitable for a wide range of precipitates and suspensions
High-Quality Cellulose Composition
- Made from pure cellulose fibers
- Ensures consistent filtration performance
- Chemically stable for general laboratory use
Versatile Application Range
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Suitable for filtering:
- Lead sulfate
- Calcium oxalate (hot)
- Calcium carbonate
- Ideal for both laboratory and industrial processes
Multiple Size Options
- Available in a wide range of circular diameters
- Compatible with standard laboratory funnels and filtration setups
Applications
- Routine laboratory filtration and clarification
- Qualitative analytical separations
- Soil analysis and agricultural testing
- Food and beverage processing (solid-liquid separation)
- Environmental monitoring (airborne dust collection)
- Gas detection via chromogenic analysis
- Educational and research laboratory use
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Type | Qualitative Filter Paper |
| Grade | Whatman Grade 1 |
| Material | Cellulose |
| Flow Rate | Medium |
| Particle Retention | ~11 µm |
| Format | Circular |
| Application | General laboratory filtration |
| Pack Size | 100 sheets per pack |
Available Models and Ordering Information
| Catalog Number | Diameter | Format | Pack Size |
|---|---|---|---|
| 1001-055 | 55 mm | Circles | 100/pk |
| 1001-070 | 70 mm | Circles | 100/pk |
| 1001-085 | 85 mm | Circles | 100/pk |
| 1001-090 | 90 mm | Circles | 100/pk |
| 1001-110 | 110 mm | Circles | 100/pk |
| 1001-125 | 125 mm | Circles | 100/pk |
| 1001-150 | 150 mm | Circles | 100/pk |
| 1001-185 | 185 mm | Circles | 100/pk |
| 1001-240 | 240 mm | Circles | 100/pk |
Unique Advantages
- Widely trusted standard for qualitative filtration
- Offers balanced flow rate and retention for diverse applications
- Available in multiple sizes to suit different setups
- Reliable performance for routine and analytical workflows
- Cost-effective solution for everyday laboratory filtration needs
The Whatman™ Grade 1 Qualitative Filter Papers (Circles) are an essential laboratory consumable, delivering consistent and reliable performance for routine filtration tasks. With their medium flow rate, excellent retention, and broad application versatility, they remain the preferred choice for laboratories, research institutions, and industrial processes worldwide.
- Diameter: Ø 90mm Ø 110mm Ø 125mm Ø 150mm Ø 185mm Ø 240mm Ø 55 mm Ø 70 mm