Grade-6
Equivalent to Whatman Grade 6
Particle Retention: 3.0μm
Product Appearance: Smooth
Filtration Speed: Slow
Ash Content(%): <0.1
Thickness(μm): 180
Basis Weight(g/m2): 105
Wet Burst(psi): 0.3
Availability: In Stock
Filter Paper Grade 6 (3 µm)
Description
Filter Paper Grade 6 is a high-retention qualitative cellulose filter paper with approximately 3 µm particle retention, designed for laboratory filtration requiring fine particle capture and reliable analytical precision.
It is widely used in analytical laboratories, environmental testing, boiler water analysis, and fine precipitate separation, where higher retention than Grade 2 is required but improved flow compared to ultra-fine grades is preferred.
What is Filter Paper Grade 6?
Grade 6 is a slow-flow qualitative filter paper manufactured from high-purity cotton linters cellulose. It features a dense yet optimized fiber structure that enables efficient retention of fine particles while maintaining more practical filtration speed than ultra-fine grades.
It is commonly selected as a precision filtration grade between Grade 2 and Grade 5, offering a balance between retention accuracy and workflow efficiency.
Key Features & Advantages
- 3 µm particle retention– suitable for fine suspended solids and analytical filtration
- Optimized slow flow rate– faster than Grade 5 while maintaining high retention
- Low ash content (<0.1%)– minimizes residue interference in analytical testing
- High wet strength– stable during gravity and controlled vacuum filtration
- Uniform cellulose structure– ensures consistent batch-to-batch performance
- Equivalent to Whatman Grade 6– standardized replacement for global laboratory use
Technical Specifications
| Parameter | Specification |
| Product Name | Filter Paper Grade 6 |
| Particle Retention | 3 µm |
| Filtration Speed | Slow |
| Basis Weight | ~105 g/m² |
| Thickness | ~180 µm |
| Ash Content | < 0.1% |
| Wet Burst Strength | > 180 mm H₂O |
| Material | High-purity cotton linters cellulose |
| Surface | Smooth |
Performance Overview
Grade 6 provides high particle retention with improved filtration efficiency compared to ultra-fine grades.
It delivers reliable performance in analytical workflows where both retention accuracy and reasonable filtration time are required.
Compared with Grade 5, Grade 6 offers similar retention capability but with improved flow performance, making it a practical choice for laboratories seeking efficiency without compromising precision.
When to Choose Grade 6
| Application Requirement | Recommended Grade |
| Fast filtration, coarse particles | Grade 4 (20 µm) |
| Balanced clarity + speed | Grade 2 (8 µm) |
| High precision, fine retention | Grade 5 (2.5 µm) |
| Precision filtration with improved efficiency | Grade 6 |
Grade 6 is ideal when you need high retention with better workflow efficiency than ultra-fine grades.
Typical Applications
- Analytical laboratory filtration
- Environmental and water quality testing
- Boiler water and industrial liquid analysis
- Fine precipitate separation
- Sample preparation for instrumental analysis
- General precision filtration workflows
Grade Comparison
| Hawach Scientific | Whatman | Advantec | Munktell | Ahlstrom | Macherey Nagel |
| Grade 6 | Grade 6 | 236 | 293/150 | 612 | 620eh |
Ordering Information
| Cat# | Description | Equivalent to Whatman | Package(pcs/pk) |
| 22012080 | Grade 6, Slow, 3um, 50mm | 1006-050 | 100pcs/pk |
| 22011125 | Grade 6, Slow, 3um, 70mm | 1006-070 | 100pcs/pk |
| 22011126 | Grade 6, Slow, 3um, 90mm | 1006-090 | 100pcs/pk |
| 22011127 | Grade 6, Slow, 3um, 110mm | 1006-110 | 100pcs/pk |
| 22011128 | Grade 6, Slow, 3um, 125mm | 1006-125 | 100pcs/pk |
| 22011129 | Grade 6, Slow, 3um, 150mm | 1006-150 | 100pcs/pk |
| 22011130 | Grade 6, Slow, 3um, 180mm | – | 100pcs/pk |
| 22012060 | Grade 6, Slow, 3um, 200mm | 1006-200 | 100pcs/pk |
| 22012061 | Grade 6, Slow, 3um, 220mm | 1006-220 | 100pcs/pk |
| 22012094 | Grade 6, Slow, 3um, 240mm | 1006-240 | 100pcs/pk |
| 22012062 | Grade 6, Slow, 3um, 250mm | 1006-250 | 100pcs/pk |
| 22012081 | Grade 6, Slow, 3um, 270mm | 1006-270 | 100pcs/pk |
| 22012063 | Grade 6, Slow, 3um, 300mm | 1006-300 | 100pcs/pk |
| 22012064 | Grade 6, Slow, 3um, 320mm | 1006-320 | 100pcs/pk |
| 22012065 | Grade 6, Slow, 3um, 350mm | 1006-350 | 100pcs/pk |
| 22012066 | Grade 6, Slow, 3um, 400mm | 1006-400 | 100pcs/pk |
| 22012082 | Grade 6, Slow, 3um, 450mm | 1006-450 | 100pcs/pk |
| 22012067 | Grade 6, Slow, 3um, 600mm | 1006-600 | 100pcs/pk |
OEM customization, private label, and bulk supply options are available for laboratories and distributors.
Download PDF Datasheet
FAQ
What is Grade 6 used for?
It is used for analytical laboratory filtration requiring fine particle retention with improved flow efficiency.
What is the particle retention?
The nominal particle retention is 3 µm, suitable for fine suspended solids and analytical workflows.
Can it be used for vacuum filtration?
Yes, it is suitable for gravity and controlled vacuum filtration under standard laboratory conditions.
How does Grade 6 compare to Grade 5?
Grade 6 provides similar retention but faster flow than Grade 5, improving workflow efficiency.
What is the ash content?
Less than 0.1%, ensuring minimal interference in analytical applications.
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