Pyramid (square) folded filter paper is easy to use and saves valuable time during repeated or multiple analyses. Fits easily into conical funnels Saves valuable time during repeated or multiple analyses Offers the same high quality and consistency Thickness 215 µm, weight 85g/m² Nominal ash content 0.007% You can find the certificate here if necessary: https://www.cytivalifesciences.com/en/de/support/quality/certificatesMeer tonenMinder tonen