Filter Paper, round, Grade 40, 55 mm, 100 pc/PAK

Whatman Grade 40 is equivalent to Schleicher &Schuell 589/2 and Munktell 389
Properties: -Medium speed filtration-Filtration speed of 340 s/100 ml-A classic general-purpose 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 atomic absorption (AA) spectrometry. Also used as a high-purity filter in the collection of trace elements and radionuclides from the atmosphere.
Grade 40: 8 µm

You may find the certificate here: https://www.cytivalifesciences.com/en/de/support/quality/certificates