2. Characteristic values

The characteristic quantities of commercial osmosis membranes have been grouped into eight groups. These are :

• of supply, which specifies the manufacturer's name, brand and membrane code;

• structural properties, which indicate the nature of the active layer;

• physico-chemical properties, which include the values of the cut-off point and the rejection rate, the compound used for the measurement usually being sodium chloride;

• transfer properties, including flow-to-water density and recovery rate;

• mechanical properties, which give the operating pressure (maximum or recommended);

• of the outfit, which reports the temperature and pH of the environment;

• ...