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Qualitative Paper Filters are extremely pure paper filters made from almost 100 % alpha cotton cellulose. Ash content app. 0.06 %. Available as plain circles and pre-pleated ready to use. Pre-pleated filters are more efficient compared to folded round filters, due to better utilization of the filter area. Thus pre-pleated filters lead to faster filtration and reduced risk of clogging. Applications - Clarify and remove precipitates - Preparation for qualitative analysis Frisenette's filters are available in many different standard sizes, both circles and squares. Special cuts available on request Just send an inquiry