Description
Filter Paper, Whatman Grade 40 / 41 / 42, 125 mm (China)
Whatman Filter Papers (Grades 40, 41, and 42) are high-purity, ashless qualitative filter papers manufactured from high-quality cotton linters and widely used in analytical and routine laboratory filtration. These filter papers are designed for reliable particle retention with consistent flow rates, making them suitable for gravimetric analysis, sample preparation, environmental testing, and chemical analysis.
All grades feature very low ash content, ensuring accurate weighing and minimal residue after ignition. The 125 mm circular format is compatible with standard laboratory funnels and vacuum filtration setups. Different grades provide varying filtration speeds and particle retention levels, allowing users to select the most suitable option based on analytical requirements.
Common Specifications (All Grades)
| Parameter | Specification |
| Brand Type | Whatman (Equivalent), China |
| Diameter | 125 mm |
| Shape | Circular |
| Material | High-purity cotton linters (≥98% alpha cellulose) |
| Ash Content | Very low (ashless, approx. ≤0.007%) |
| Quantity per Pack | Typically 100 circles |
| Application Area | Analytical & general laboratory filtration |
Grade Variations & Technical Details
Grade 40 – Medium Flow, General Purpose
| Parameter | Specification |
| Grade | 40 |
| Particle Retention | ~8 µm |
| Flow Rate | Medium |
| Typical Use | Routine filtration, qualitative analysis, general laboratory work |
Grade 41 – Fast Flow, Coarse Retention
| Parameter | Specification |
| Grade | 41 |
| Particle Retention | ~20–25 µm |
| Flow Rate | Fast |
| Typical Use | Gravimetric analysis, filtration of coarse precipitates (e.g., Al(OH)₃, Fe(OH)₃), air pollution testing |
Grade 42 – Slow Flow, Fine Retention
| Parameter | Specification |
| Grade | 42 |
| Particle Retention | ~2.5 µm |
| Flow Rate | Slow |
| Typical Use | Fine precipitates, gravimetric analysis, cement testing, barium sulfate analysis |
Available Variants
- Filter Paper Grade 40, 125 mm
- Filter Paper Grade 41, 125 mm
- Filter Paper Grade 42, 125 mm
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