Whatman 1820-047 Glass Microfiber Binder Free Filter, Grade Gf/A, 1 Point 6 These GF/A glass microfiber filters offer fine particle retention and high flow rate, as well as good loading capacity. Used for high efficiency general purpose laboratory filtration, including water pollution monitoring of effluents, for filtration of water, algae and bacteria cultures, foodstuff analyses, protein filtration and radioimmunoassay of weak ß emitters. Recommended for gravimetric determination of airborne particulates, stack sampling and absorption methods of air pollution monitoring. Retention: 1.6µm. Diameter: 4.7cm. 100/Pack. Whatman #: 1820-047. Diameter: 4.7cm Grade GF/A; Retention: 1.6µm Fine particle retention; high flow rate; good loading capacity; used for high efficiency general purpose laboratory filtration Uses include water pollution monitoring of effluents, water filtration, algae and bacteria cultures, foodstuff analyses, protein filtration, radioimmunoassay of weak ß emitters Recommended for gravimetric determination of airborne particulates, stack sampling and absorption methods of air pollution monitoring