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Labasics Qualitative Filter Paper Circles, 90 mm Diameter Cellulose Filter Paper with 15-20 Micron Particle Retention Medium Filtration Speed, Pack of 100 electronics3 and cyanuric acid all atLabasics Qualitative Filter Paper Circles, 90 mm Diameter Cellulose Filter Paper with 15 20 Micron Particle Retention Medium Filtration Speed, Pack of 100 Product Features Coarse cellulose filter papers remove particles 15 to 20 m Filtration speed: 35 70 sec Ash content: equal or less than 0. 15% Compatible with Labasics Porcelain Buchner Funnel 100mm