Filter Paper Grade 2 (8 µm)

Filter Paper Grade 2 is a qualitative cellulose filter paper with 8 µm medium particle retention, designed for laboratory filtration applications requiring improved clarity and efficient separation of fine suspended solids and precipitates.

It is widely used in environmental testing, chemical analysis, soil filtration, and general laboratory sample preparation where Grade 1 is too coarse but ultra-fine grades are not required.

Grade 2 provides an optimal balance between filtration speed and clarity, making it a reliable “step-up grade” for routine laboratory workflows.

What is Filter Paper Grade 2?

Grade 2 is a medium-retention qualitative filter paper manufactured from high-purity cotton linters. It features a uniform cellulose fiber network that ensures stable pore distribution, consistent flow rate, and reproducible filtration results.

It is typically selected when finer particle capture is required than Grade 1, without significantly reducing filtration efficiency.

Key Features & Advantages

• 8 µm particle retention – effective for fine suspended solids and precipitate removal
• Balanced filtration speed – improved clarity with only moderate flow reduction vs Grade 1
• Low ash content (<0.1%) – reduces residue interference in analytical testing
• High wet strength – stable performance in gravity and vacuum filtration
• Uniform cellulose structure – ensures batch-to-batch consistency
• Low extractable background – suitable for sensitive laboratory analysis

Technical Specifications

Performance & Quality Validation

Grade 2 is engineered for stable laboratory performance under both gravity and vacuum filtration conditions.

Internal laboratory validation confirms consistent filtration behavior across repeated runs, with reliable retention of fine particles and stable flow performance under standard vacuum conditions (up to 0.8 bar).

When to Choose Grade 2

Grade 2 is ideal when you need improved clarity without sacrificing workflow efficiency.

Typical Applications

• Environmental and water sample clarification
• Fine precipitate separation in chemical analysis
• Soil and agricultural sample filtration
• Sample preparation for instrumental analysis (HPLC / ICP-MS prefiltration)
• General laboratory qualitative filtration
• Educational laboratory use

Related products: Syringe Filters| All Filter Papers

Grade Comparison

Ordering Information

OEM, private label, and bulk supply options are available for laboratories, distributors, and industrial users.
Download PDF Datasheet

FAQ

What is Grade 2 used for?

It is used for laboratory filtration requiring finer particle retention than Grade 1, especially in environmental testing and sample preparation.

What is the particle retention?

The nominal particle retention is 8 µm, suitable for fine suspended solids and analytical workflows.

Can it be used for vacuum filtration?

Yes, it is suitable for both gravity and vacuum filtration under standard laboratory conditions (recommended below 0.8 bar).

How does Grade 2 compare to Grade 1?

Grade 2 provides finer retention (8 µm vs 11 µm) with only moderate reduction in filtration speed.

What is the ash content?

Less than 0.1%, minimizing residue interference in analytical applications.