Cation-Exchange Membrane for Electrodialysis - dry storage

Product specification The membrane resistance per surface unit is determined as follows: a)... more

Product specification

The membrane resistance per surface unit is determined as follows:

a) The sample is steeped 4 hours in a 1:1 mixture of 1.0 N NaCl and 1.0 N HCl and afterwards shaked for 24 hours in a 125 ml bottle containing 1.0 N NaCl.

b) Then the sample is exposed to a direct current for 8 minutes in a photoconductive cell containing 1.0 N NaCl. After the first 4 minutes polarity should be changed.

c) With the 3400 series the sample is heated in 0.1 N NaCl for 20 minutes at +100 °C, but with the 3100 series at +80-90 °C. Afterwards the surface resistance per unit is determined.

The membranes are supplied dry and should be stored at a dark place (max. +15 °C). Only for activation they have to be loaded in a 10 % salt solution at +55 °C for at least 3 hours

Chemical stability:

Good chemical stability in neutral solutions, in acid solutions (ph 0-7) and in alkaline solutions (ph 7-11)

Fair chemical stability in alkaline solutions (ph 11-14) an to mild oxidizing agents

Poor chemical stability to reducing agents

Technical specification

Electrical resistance: 15 Ohm/cm² (0.1 N NaCI); 6 Ohm/cm² (1.0 N NaCI)

Permeability: 96 % (0.5 N NaCI/1.0 N NaCI)

Water permeability: <3.2 ml/h/dm² (at 0.35 kg/cm²)

Pressure resistance: min. 14 kg/cm²

Thickness: approx. 0.40 mm

Density: approx. 405 g/m³

Capacity: 1.22 meq/g

Max. temperature: +95 °C

Dimensional stability: wet: excellent; dry: good

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