Quantitative (ashless) Paper Filters are made from 100 % cotton linters and are free from impurities since the paper is acid washed and cleaned with ultra pure water.
Ash content Advantec: app. 0.008 %. Frisenettte app. 0.007 %.
Available as sheets, plain circles or pre-pleated ready to use. Frisenette's filters are also available in special cuts.
Paper filters, circles and sheets
Paper filters, circles and folded