Round filters Type, MN 640 w, , 55 mm, 100 Piece(s)

For qualitative analysis. Made from refined pulp washed in acid and linters with a α cellulose content of over 95%. Ash content <0.01%. Temperature stable up to approx. +130 °C. Surface weight: 85 g/m².

Fast filtration speed. Filtration time according to DIN 53137: 9 s. Equivalent black strip. Soft filter with a loose structure for coarse deposits like iron and aluminium hydroxide, bismuth, copper, iron sulphide, nickel-dimethylglyoxime, etc. Standard filter for determining Si. Retention range: >8 μm