TECHNICAL INFORMATION

CLEANING AND STORAGE INSTRUCTIONS

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COMPOSITION

CHEMICAL TOLERANCES Starting Letter: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

TEMPERATURE TOLERANCES

PREPARATION & STORAGE INSTRUCTIONS

The dry membrane should be stored away from direct sunlight in a minimum relative humidity of 35% at a temperature of 23ºC. Membranes keep well under these conditions but should always be examined 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 which will remove the glycerine is washing the membrane in warm water. For more complete cleaning three methods are recommended.

CLEANING METHOD 1
The glycerine can be removed by washing the tubing in running water for 3 - 4 hours. Removal of sulphur compounds may be accomplished by treating the tubing with sodium sulphide solution (0.3%) at 80ºC for 1 minute, wash with hot water (60ºC) for 2 minutes, followed by acidification with sulphuric acid (0.2%), and washing with hot water to remove the acid.

CLEANING METHOD 2
Heat the membrane in a large volume of 2% sodium bicarbonate and 1 millimolar EDTA at 80ºC for 30 minutes. Rinse the tubing thoroughly in pyrogen-free distilled water.

CLEANING METHOD 3
MEDICELL International Ltd supply the Spectrum Sulphide Removal Kit (132906) and Heavy Metal Cleaning Solution (132908). Detailed instructions on the use of these solutions is supplied with the kits. Please contact Medicell directly for details.

After cleaning, the membranes should be stored, fully immersed, in one of the following; 1% Formaldehyde, 1% sodium benzoate or 0.1% sodium azide solutions, at 4ºC. If the membrane is to be stored for only a short period it will be possible to immerse the membrane in distilled water, ensuring full coverage at all times

We are interested in hearing your experiences of using these or any other cleaning and storage processes and would welcome e-mails so that we can develop our database further.

Please read the disclaimer relating to these data.

LAST UPDATED

13 Sep 2004