Grade-4
Equivalent to Whatman Grade 4
Particle Retention: 20μm
Product Appearance: Smooth
Filtration Speed: Fast
Ash Content(%): <0.1
Thickness(μm): 205
Basis Weight(g/m2): 96
Wet Burst(psi): 0.7
Availability: In Stock
Filter Paper Grade 4 (20 µm)
Description
What is Filter Paper Grade 4?
Filter Paper Grade 4 is a fast-flow qualitative cellulose filter paper with approximately 20 µm particle retention, designed for rapid laboratory filtration of coarse particles and high-throughput sample clarification.
It is widely used in routine laboratory filtration, biological sample processing, environmental pre-filtration, and general chemical analysis where filtration speed is more important than fine particle retention.
It is typically selected for fast filtration workflows where moderate clarity is sufficient and high throughput is required.
Key Features & Advantages
- 20 µm particle retention– suitable for coarse particles and pre-filtration
- Very fast filtration speed– optimized for high-throughput laboratory workflows
- Low ash content (<0.1%)– reduces contamination in routine analysis
- Good wet strength– stable during gravity and light vacuum filtration
- Uniform cellulose structure– ensures consistent batch performance
- High chemical compatibility– suitable for aqueous and mild organic systems
Technical Specifications
| Parameter | Specification |
| Product Name | Filter Paper Grade 4 |
| Particle Retention | 20 µm |
| Filtration Speed | Fast |
| Basis Weight | 96 g/m² |
| Thickness | ~205 µm |
| Ash Content | < 0.1% |
| Wet Burst Strength | > 120 mm H₂O |
| Material | High-purity cotton linters cellulose |
| Surface | Smooth |
Performance Overview
Grade 4 is optimized for rapid filtration tasks where flow rate is the primary requirement.
Its open pore structure enables fast liquid passage while effectively retaining coarse particles such as gelatinous precipitates and suspended solids.
Compared with finer grades, Grade 4 significantly reduces filtration time, making it ideal for high-volume laboratory workflows.
When to Choose Grade 4
| Application Requirement | Recommended Grade |
| Fast filtration, coarse particles | Grade 4 |
| Balanced clarity + speed | Grade 2 |
| Fine / ultra-fine analysis | Grade 5 / Grade 6 |
Grade 4 is ideal when filtration speed is more important than fine particle retention.
Typical Applications
- Rapid biological liquid filtration
- Coarse particle separation in chemical processes
- Pre-filtration of environmental and water samples
- General laboratory routine filtration
- Educational laboratory demonstrations
Grade Comparison
| Hawach Scientific | Whatman | Advantec | Munktell | Ahlstrom | Macherey Nagel | Sartorius |
| Grade 4 | Grade 4 | 1 | 1288/3 | 631 | 1670 | 604 |
Ordering Information
| Cat# | Description | Equivalent to Whatman | Package(pcs/pk) |
| 22012072 | Grade 4, Fast, 20-25um, 50mm | 1004-050 | 100pcs/pk |
| 22012073 | Grade 4, Fast, 20-25um, 55mm | 1004-055 | 100pcs/pk |
| 22011113 | Grade 4, Fast, 20-25um, 70mm | 1004-070 | 100pcs/pk |
| 22011114 | Grade 4, Fast, 20-25um, 90mm | 1004-090 | 100pcs/pk |
| 22011115 | Grade 4, Fast, 20-25um, 110mm | 1004-110 | 100pcs/pk |
| 22011116 | Grade 4, Fast, 20-25um, 125mm | 1004-125 | 100pcs/pk |
| 22011117 | Grade 4, Fast, 20-25um, 150mm | 1004-150 | 100pcs/pk |
| 22011118 | Grade 4, Fast, 20-25um, 180mm | – | 100pcs/pk |
| 22012074 | Grade 4, Fast, 20-25um, 185mm | 1004-185 | 100pcs/pk |
| 22012036 | Grade 4, Fast, 20-25um, 200mm | 1004-200 | 100pcs/pk |
| 22012037 | Grade 4, Fast, 20-25um, 220mm | 1004-220 | 100pcs/pk |
| 22012038 | Grade 4, Fast, 20-25um, 240mm | 1004-240 | 100pcs/pk |
| 22012039 | Grade 4, Fast, 20-25um, 250mm | 1004-250 | 100pcs/pk |
| 22012075 | Grade 4, Fast, 20-25um, 270mm | 1004-270 | 100pcs/pk |
| 22012040 | Grade 4, Fast, 20-25um, 293mm | – | 100pcs/pk |
| 22012041 | Grade 4, Fast, 20-25um, 300mm | 1004-300 | 100pcs/pk |
| 22012042 | Grade 4, Fast, 20-25um, 320mm | 1004-320 | 100pcs/pk |
| 22012043 | Grade 4, Fast, 20-25um, 350mm | 1004-350 | 100pcs/pk |
| 22012076 | Grade 4, Fast, 20-25um, 400mm | 1004-400 | 100pcs/pk |
| 22012044 | Grade 4, Fast, 20-25um, 450mm | 1004-450 | 100pcs/pk |
| 22012045 | Grade 4, Fast, 20-25um, 600mm | 1004-600 | 100pcs/pk |
OEM customization, private label, and bulk supply are available for laboratories and distributors.
Download PDF Datasheet
FAQ
What is Grade 4 used for?
It is used for rapid laboratory filtration where coarse particle retention and high speed are required.
What is the particle retention?
Approximately 20 µm, suitable for coarse particles and pre-filtration applications.
Can it be used for vacuum filtration?
Yes, it is suitable for gravity filtration and light vacuum filtration under standard laboratory conditions.
How does Grade 4 compare to Grade 2?
Grade 4 offers significantly faster filtration but lower particle retention than Grade 2.
What is the ash content?
Less than 0.1%, ensuring low residue in routine laboratory applications.
The quality has a guarantee
Fast & safe shipping worldwide
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