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    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.


    Click on a Grade to find out more...

    Grade 301

    - Very Slow Filtering
    Application :

    Barium sulphate, metastannic acid, cuprous oxide etc

    Grade 302

    - Medium Filtering
    Application :

    Dyes, ether, alcoholic solutions, eaux de cologne, salted solutions, vegetal extracts, hair solutions, perfumes, tinctures, saccharine juices and vinegar

    Grade 303

    - Medium Filtering
    Application :

    Suitable for fast filtration of liquid with fine particles

    Grade 304

    - Medium Filtering
    Application :

    Filter paper used in analytical works in laboratories

    Grade 305

    - Fast Filtering
    Application :

    For coarse and voluminous precipitates like hydroxides and sulphides

    Available Grades
    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