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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. The ash content is 0.007 %. Available as plain circles and pre-pleated ready to use. Applications - Environmental analysis - Gravimetric analysis Filters are available in diffrent standard sizes**.If you are looking for a size that is not available in the standard range, we can certainly make it for you at a very competitive price. Just send an inquiry.**