Filter Paper, round, Grade 44, 70 mm, 100 pc/PAK

Whatman Grade 44 is equivalent to Schleicher & Schuell 589/3 and Munktell 391
Properties: -Slow filtration-Filtration rate of 995 s/100 ml-This is the thinner version of Grade 42 which retains very fine particles but has a lower ash content per sample and is almost twice as fast as Grade 42.
These are very pure filters suitable for a wide range of critical analytical filtration procedures. Whatman quantitative filters from GE Healthcare are designed for gravimetric analysis and the preparation of samples for instrumental analysis. They are available in three formats designed to meet specific needs. Grade 44 is a thin version of Grade 42 that retains very fine particles but with lower ash weight per sample and almost twice the flow rate of Grade 42. Grade 44: 3 µm

Here you can find the certificate: https://www.cytivalifesciences.com/en/de/support/quality/ certificates