Grade A is a Binderless Borosilicate Glass Microfiber Filters.  Fine porosity, fast flow rate, high load capacity with a 1.5μm size particle retention, and a 2.25μm mean pore size. These binderless borosilicate glass microfiber filters are used in the filtration of precipitated proteins and cells. Also ideally suited as a filter for radioimmuno assay of weak beta emitters by scintillation counting and gravimetric determination of airborne particulate.