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Cytiva (Formerly GE Healthcare Life Sciences) Whatman QM-C Quartz Filter Paper, Sheets, Quantity: 25/Pk., Format: Sheets, Grade: Grade QM-C, Silica, Airflow Rate: 19 s/100 mL/in2, Basis Weight: 85 g/m2, Description: Pre-Fired, Binder-Free, Dimensions: 8 x