MUNKTELL CELLULOSE NITRATE MEMBRANE FILTERS

Cellulose nitrate membrane filters are used in a large number of analytical and laboratory processes that require filtration.They are hydrophilic and have a uniform pore structure across a wide range of pore sizes and, therefore, are recommended for sample pre-treatment, particle testing and particle remval.

These membranes have a high non-specific adsorption behaviour which makes them suitable for many blotting procedures and for diagnostic kits. The adsorption decreases with increasing pore size.

Sterile, individually packed membrane filters are standard for routine microbiological control. Filter dentification and batch number are printed on each individual pack. During production, we check every single membrane and pack prior to shipping.

All gridded membranes are made of cellulose nitrate which guarantees excellent retention and colony growth. The grid size is 3.1 x 3.1 mm and can be supplied in black, white and green colour. White membranes with black grid and green membranes with dark green grid are used for colony growth. Grey/black membranes with white grid are used for the detection of yeasts and moulds. White membranes with green grid are used for E.coli and coliforms. Our programme also comprises gridded and sterile membranes with a pink-coloured hydrophobic edge.

We also offer non-sterile, gridded membranes in standard packing for particle counting and microscopy.



SPECIFICATION FOR CELLULOSE NITRATE MEMBRANES

Bubble Point (minimum value, wetted with water):

0.2 μm . . . . . . . . . . . . . 4.2 bar

0.45 μm . . . . . . . . . . . . . 2.5 bar

0.65 μm . . . . . . . . . . . . . 2.0 bar

0.8 μm . . . . . . . . . . . . . 1.4 bar

1.2 μm . . . . . . . . . . . . . 1.0 bar

3.0 μm . . . . . . . . . . . . . 1.6 bar

5.0 μm . . . . . . . . . . . . . 0.5 bar

8.0 μm . . . . . . . . . . . . . 0.3 bar

0.2 μm cellulose nitrate membrane filters are available only in gridded, sterile and individually packed version.



Flow rates (mean values per cm²

with water and △p = 1 bar (100 kPa)):

0.2 μm . . . . . . . . . . . . . 22 ml/min

0.45 μm . . . . . . . . . . . . . 69 ml/min

0.65 μm . . . . . . . . . . . . . 130 ml/min

0.8 μm . . . . . . . . . . . . . 200 ml/min

1.2 μm . . . . . . . . . . . . . 320 ml/min

3.0 μm . . . . . . . . . . . . . 430 ml/min

5.0 μm . . . . . . . . . . . . . 570 ml/min

8.0 μm . . . . . . . . . . . . . 750 ml/min



Compatibility:

compatible with aqueous solution in pH range 4-8,

resistant to hydrocarbons and some organic solvents.

Sterilization:

Autoclave (121°C), g-radiation (25 KGg) or with ethylene oxide.

Max. temperature resistance: 130°C.

Thickness: varies acc. to pore diameter between 140 μm (8 μm) and 90 μm (0.1 μm).

Validation:

Sterilization Capability of 0.2 μm membrane filter has been verified with the BCT (Bacteria Challenge Test).