Grade 40 Quantitative Filter Paper

Photo of Whatman Grade 40 Quantitative Filter Paper

Whatman No. 40 is the classic general purpose quantitative ashless filter paper with medium speed and retention (8 µm). 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.