merek MACHEREY NAGE: (GERMANY) Cat. 43 10 15 Diameter : 150 mm 100 circles/pk Medium speed filtration, smooth (setara whatman No. 1) Thickness : 0.16 mm Filtration speed : 22 s Basis Weight : 70 g/m2 (pack of 100 circles) STANDARD FILTER PAPERS FOR QUALITATIVE ANALYSES Qualitative filter papers are manufactured from the same raw materials as the ashless grades and are particularly for general laboratory filtrations. The average ash content is about 0.1 %, the amount of -cellulose is about 95%