Paper made from glass microfiber 100% borosilicate without binder. Very fast filtration with a high retention and capacity of fine particles . For general use in laboratory. Can be used at very high temperature. Surface weight 37 g/m², pore 1,6 ?m, thickness 190 ?m. Available in flat disks. Equivalent to: Whatman GF/A, Macherey Nagel GF-1, S&S GF50