Grade GF 8 Glass Microfiber Filter with Binder, circle, 47 mm Grade GF 8 glass microfiber filter used in the filtration of coarse particles. This glass fiber filter is used in the filtration of coarse particles. Frequently used in: Environmental analysis, in the determination of PCB, DDE, DDT, furans, and dioxins in the air; pollution measurements in industrial, urban and populated areas, cement factories, iron and steel industry; dust measurements at the workplace; determination of the dust fraction in technical gases; and testing the effectiveness of dustcollecting. Grade GF 8: Inorganic binder