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Cytiva Whatman™ Qualitative Filter Paper: Grade 4 Circles 
Filters and retains coarse particles for monitoring air pollution. Whatman™ Qualitative Filter Paper: Grade 4 Circles are used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical.
Supplier: Cytiva 1004125
Catalog No. 09-825D
Description
Filters and retains coarse particles for monitoring air pollution. Whatman™ Qualitative Filter Paper: Grade 4 Circles are used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical.
These cellulose filters are used in qualitative analytical techniques to determine and identify materials and for clarifying liquids.
- Particle Retention: 25μm
- Porosity: Coarse
- Filtration speed: Herzberg, 37 sec.
- Surface: smooth
- Extremely fast filtering with excellent retention of coarse particles and gelatinous precipitates such as ferric hydroxide and aluminum hydroxide
- Useful as a rapid filter for routine clean-up of biological fluids or organic extracts during analysis
Specifications
| Grade 4 Qualitative Filter Paper Standard Grade, circle, 125 mm | |
| Cellulose | |
| 20 to 25 μm | |
| Fast | |
| Grade 4 | |
| 100 Pack | |
| Qualitative Filter Paper | |
| 4.92 in. |
| Disc | |
| Coarse particles and gelatinous precipitates | |
| 37 sec. | |
| A standard grade filter used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical. | |
| Medium | |
| 210 μm | |
| Ø 125 mm | |
| 125 mm |