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This Reeve Angel qualitative filter paper, Grade 226, is manufactured primarily for routine, noncritical laboratory filtration applications. It contains wet-strength additives and should not be used for Kjeldahl Nitrogen determinations. These Reeve Angel papers provide consistent quality and performance. For pharmaceuticals, biological filtration, cytology, microbiology and sugar analysis. Diameter: 20cm. Thickness: 0.28mm. Surface: Crepe, Gray. Precipitates Retained: Coarse/Gelatinous. Filtration Speed: Fast. Nominal Retention 98% Efficient At: 20 to 25µm. Weight: 87g/m².