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    What is Grade 323?

    This fast flow rate grade with very good retention is a tighter version of Grade 325. A general purpose creped filter has a rough surface for less critical routine analysis. It is often found in the food industry and is widely used to assay sucrose in cane sugar and within pharmaceutical laboratories for routine filtration. These extremely strong filter papers have a high wet strength due to the addition of a small quantity of chemically stable resin. Normal qualitative applications will not introduce any significant impurities into the filtrate. The resins do however, contain nitrogen so these grades should not be used in Kjeldahl estimations etc. Some wet strengthened grades are available in folded (pre-pleated) forms.

    Whatman Cross Reference = No.91
    Speed class Fast Filtration
    Thickness (mm) 0.14
    Pore size (μM) 20-30
    Weight (g/m²) 64
    Filtration Speed (sec*) 30
    Burst Strength (Kg/cm²) 1.6
    *According to DIN 53137
    Diameter (mm) Product Code
    55 323055
    70 323070
    90 323090
    110 323110
    125 323125
    150 323150
    185 323185
    240 323240
    300 323300
    320 323320