Whatman™ Grade 41 Quantitative Ashless Filter Papers
Manufacturer: VWR International
Description
The filter’s core strength lies in its purity and specific retention profile. With an extremely low ash content (0.007% max), it ensures accurate gravimetric analysis. It provides excellent retention for difficult precipitates such as iron or aluminum hydroxides (20-25 µm particle retention). Grade 41 is also widely used in air pollution monitoring and in the preparation of solid environmental samples (soils, sludges) for metals analysis after nitric acid digestion. This reliable paper streamlines your process while guaranteeing the precision required for compliant testing.
Features:
- Ashless filter paper with extremely low ash content (0.007% maximum)
- Coarse porosity and Fast Flow Rate (54 s Herzberg) for maximum throughput
- Excellent retention of coarse particles and gelatinous precipitates (20-25 µm)
- Ideal for gravimetric analysis and filtering precipitates like iron and aluminum hydroxides
- Used in air pollution analysis and preparation of environmental samples for metals analysis
| SKU | Flow Rate | Retention | Shape | Porosity | Color |
|---|---|---|---|---|---|
| 28477-974-PK | Fast | 20 µm - 25 µm | Circle | Coarse | White |
| 28477-994-PK | Fast | 20 µm - 25 µm | Circle | Coarse | White |
| 28478-002-PK | Fast | 20 µm - 25 µm | Circle | Coarse | White |
| 28478-024-PK | Fast | 20 µm - 25 µm | Circle | Coarse | White |
| 28478-046-PK | Fast | 20 µm - 25 µm | Circle | Coarse | White |
| 28478-068-PK | Fast | 20 µm - 25 µm | Circle | Coarse | White |
| 28478-080-PK | Fast | 20 µm - 25 µm | Circle | Coarse | White |
| 28478-104-PK | Fast | 20 µm - 25 µm | Circle | Coarse | White |
| 28297-291-PK | Fast | 20 µm - 25 µm | Circle | Coarse | White |
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Whatman™ Filter Paper Decision Chart | Download |
| SKU | Material | Thickness | Type | Grade | Basis Weight | Air Flow Rate |
|---|---|---|---|---|---|---|
| 28477-974-PK | Ashless | 215 µm | Quantitative | Grade 41 | 85 g/m2 | 4 s/100 mL/in2 |
| 28477-994-PK | Ashless | 215 µm | Quantitative | Grade 41 | 85 g/m2 | 4 s/100 mL/in2 |
| 28478-002-PK | Ashless | 215 µm | Quantitative | Grade 41 | 85 g/m2 | 4 s/100 mL/in2 |
| 28478-024-PK | Ashless | 215 µm | Quantitative | Grade 41 | 85 g/m2 | 4 s/100 mL/in2 |
| 28478-046-PK | Ashless | 215 µm | Quantitative | Grade 41 | 85 g/m2 | 4 s/100 mL/in2 |
| 28478-068-PK | Ashless | 215 µm | Quantitative | Grade 41 | 85 g/m2 | 4 s/100 mL/in2 |
| 28478-080-PK | Ashless | 215 µm | Quantitative | Grade 41 | 85 g/m2 | 4 s/100 mL/in2 |
| 28478-104-PK | Ashless | 215 µm | Quantitative | Grade 41 | 85 g/m2 | 4 s/100 mL/in2 |
| 28297-291-PK | Ashless | 215 µm | Quantitative | Grade 41 | 85 g/m2 | 4 s/100 mL/in2 |
Starting at $42.75
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