This Reeve Angel qualitative filter paper, Grade 802, 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 general and organic chemistry, pharmaceuticals, pharmacology, emulsions, petroleum testing, soaps and detergents, sugar filtration. Diameter: 12.5cm. Thickness: 0.26mm. Surface: Crepe, Prepleated. Shape: Circle. Precipitates Retained: Coarse/Gelatinous. Filtration Speed: Fast. Nominal Retention 98% Efficient At: 20 to 25μm. Weight: 73g/m².