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The classic general purpose ashless filter paper with medium speed and retention. Typical applications include gravimetric analysis for numerous components in cements, clays, iron and steel products; as a primary filter for separating solid matter from aqueous extracts in general soil analysis, quantitative determination of sediments in milk and as a pure analytical grade clean-up filter for solutions prior to AA spectrophotometry. Used also as a high purity filter in the collection of trace elements and radionuclides from the atmosphere. Retention: 8µm. Diameter: 1.27cm. 400/Pack. Whatman #: 1440-012.