CMI-7000 Cation Exchange Membranes
Technical Specifications

Technical Specification CMI-7000S
Single Sheet
Functionality Strong Acid Cation Exchange Membrane
Polymer Structure Gel polystyrene cross linked with divinylbenzene
Functional Group Sulphonic Acid
Ionic Form as Shipped Sodium
Color Brown

Standard Size

US
Metric

48in x 120in
1.22m x 3.05m

Standard Thickness

(mils)
(mm)

18±1
0.45±0.025
Electrical Resistance (Ohm.cm2)
0.5 mol/L NaCl
<30
Maximum Current Density (Ampere/m2) <500
Permselectivity (%)
0.1 mol KCl/kg / 0.5 mol KCl/kg
94
Total Exchange Capacity (meq/g) 1.6±0.1
Water Permeability
(ml/hr/ft2) @5psi
<3
Mullen Burst Test strength (psi) >80
Thermal Stability (oC) 90
Chemical Stability Range (pH) 1-10
Preconditioning Procedure Immerse the membrane in either the application solution or a 5% NaCl solution for 12 hours to allow for membrane hydration and expansion.
Storage Store at room temperature and low humidity in sealed air tight container. Storage period not to exceed one year.

All information described in this bulletin is based upon tests and data believed to be reliable. It is the user’s responsibility to determine performance and suitability of the products. No guarantee, expressed or implied, is made by Membranes International Inc., nor does Membranes International Inc. assume any liability for patent infringement arising from the use of these products.