Visking Dialysis Membranes in London Visking membranes are cellulose based tubes and sheets which have a selective porosity and are therefore widely used where osmosis and filtration are employed. The membranes are easy to use and offer a cost effective separation tool.
Visking Dialysis Membranes are a low cost and effective range of membranes which includes lower molecular weight cut-off membranes, smaller bore tubing and flat sheets.
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VISKING DIALYSIS TUBING Molecular Weight Cut-off 3500 Daltons
Molecular Weight Cut-off 7000 Daltons
Molecular Weight Cut-off 12-14000 Daltons
VISKING DIALYSIS FLAT MEMBRANES Molecular Weight Cut-off 3500 Daltons
Molecular Weight Cut-off 7000 Daltons
Molecular Weight Cut-off 14000 Daltons
VISKING DIALYSIS MEMBRANES are graded according to Molecular Weight Cut Off (MWCO). It is always advisable to use a membrane with a cut off well below the molecular weight of the molecule to be retained. See also our disclaimer.
Visking dialysis membranes are supplied in dry form as tubing or flat sheets which require cleaning before use.
Storage: The dry membrane should be stored in the sealed bag provided. Store in a dry, well ventilated room at normal room temperature (15 �C - 25 �C) in a minimum relative humidity of 35%, avoiding direct sunlight and heat sources. Membranes keep well under these conditions but should always be examined prior to use to ensure no drying out has occurred.
The impurities present as a result of the manufacturing processes may be removed by various methods depending upon how clean the membrane has to be for your purposes.
Some cleaning of the membrane is necessary in all cases because the glycerine must be removed before the membranes function properly. The simplest method for the removal of glycerine is washing the membrane in warm water.
For more complete cleaning, three methods are recommended.
VISKING DIALYSIS MEMBRANES are made from natural cellulose (cotton linters) by dissolving it in special inorganic solvents and reforming the polymer by removing the solvent to form flat sheet, tubular or hollow fibre membranes. The material has the elastic and flaccid characteristics of a gel when wet with water. Regenerated cellulose, like its parent native cellulose, is quite resistant to organic solvents, elevated temperatures and extremes of pH.
IMPURITIES AND TRACE ELEMENTS: The membranes, which are supplied dry, contain glycerine which acts as a humectant to prevent brittleness. This must be removed before the membranes can be used.
All membranes contain the following trace impurities:
0.1% sulphur Calcium <0.02 ppm Chromium 0.1- 0.2 ppm Copper 0.8 - 1.2 ppm Iron 20 - 60 ppm Lead 2.0 - 6.0 ppm Magnesium 0.1 - 0.3 ppm Nickel 1.3 - 1.7 ppm Zinc 1.5 - 5.0 ppm To remove some or all of the impurities please see our washing instructions.
Disclaimer
Contact Us For more details, contact Medicell Membranes Ltd in London today on 020 7607 2295 contact form .
Based in London, we have been supplying specialist laboratory materials to research institutions, universities, hospitals and schools since 1972.
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