Standard Qualitative Filter Paper
Standard Qualitative Filter Papers are used for low gravity, or quadrant-folded applications. Standard Qualitative Filter Papers have a higher level of α- cellulose than other filter papers. This means that they will weaken when the papers are introduced to water. We do not recommend Standard Qualitative Filter Papers if wet handling or vacuum work is necessary. In routine quadrant-folded applications the underlying strength of standard (untreated) grades does not present an issue.
Grades
Click on a Grade to find out more...
Grade 301
- Very Slow FilteringApplication :
Barium sulphate, metastannic acid, cuprous oxide etc
Grade 302
- Medium FilteringApplication :
Dyes, ether, alcoholic solutions, eaux de cologne, salted solutions, vegetal extracts, hair solutions, perfumes, tinctures, saccharine juices and vinegar
Grade 303
- Medium FilteringApplication :
Suitable for fast filtration of liquid with fine particles
Grade 304
- Medium FilteringApplication :
Filter paper used in analytical works in laboratories
Grade 305
- Fast FilteringApplication :
For coarse and voluminous precipitates like hydroxides and sulphides
Grade | Whatman Equivalent | Speed | Thickness (mm) | Pore Size (μM) | Weight (g/m²) | Filtration Speed (sec*) | Burst Strength (kg/cm²) |
---|---|---|---|---|---|---|---|
Grade: 301 | Whatman Equivalent: = No.5 | Speed: Very Slow Filtering | Thicness (mm): 0.14 | Pore size: 2-3 | Weight: 84 | Filtration speed (sec*): 180 | Burst strength (kg/cm²): > 0.30 |
Grade: 302 | Whatman Equivalent: = No.3 | Speed: Medium Filtering | Thicness (mm): 0.3 | Pore size: 12-16 | Weight: 150 | Filtration speed (sec*): 65 | Burst strength (kg/cm²): 3.90 |
Grade: 303 | Whatman Equivalent: = No.2 | Speed: Medium Filtering | Thicness (mm): 0.16 | Pore size: 5-8 | Weight: 87 | Filtration speed (sec*): 50 | Burst strength (kg/cm²): > 0.10 |
Grade: 304 | Whatman Equivalent: = No.1 | Speed: Medium Filtering | Thicness (mm): 0.16 | Pore size: 5-13 | Weight: 73 | Filtration speed (sec*): 88 | Burst strength (kg/cm²): 1.95 |
Grade: 305 | Whatman Equivalent: = No.4 | Speed: Fast Filtering | Thicness (mm): 0.20 | Pore size: 12-15 | Weight: 84 | Filtration speed (sec*): 10 | Burst strength (kg/cm²): > 0.30 |