MN 615 is the most widely used general purpose filter paper with medium retention and flow rate. Covers a wide range of laboratory applications and is frequently used for claryfing liquids. - Filtration speed acc. to DIN 53137: 22 s. - Thickness: 0.16 mm. - Weight: 70 g / m². MN 615 is the most widely used general purpose filter paper with medium retention and flow rate. Covers a wide range of laboratory applications and is frequently used for claryfing liquids. - Filtration speed acc. to DIN 53137: 22 s. - Thickness: 0.16 mm. - Weight: 70 g / m².