Anion-Exchange Membrane (ASTOM, NEOSEPTA series) for Electrodialysis (ED) and Electrodeionization (EDI), CEEANAEM
Use your own shipping account?
We support FedEx, UPS, and DHL third-party billing for institutional customers.
Place your order first, then email shipping@echemsupplies.com with your account details and order number. We'll generate the label using your account and refund your shipping charges, less a handling fee.
ASTOM Corporation (formerly part of Tokuyama) is considered the global leader in the production of homogeneous ion exchange membranes. Their membranes, branded as Neosepta™, are the industry standard for high-performance Electrodialysis (ED) and Electrodeionization (EDI) due to their unique "Paste Method" manufacturing, which combines molecular uniformity with extreme mechanical ruggedness.
Ultrapure Water (UPW) via EDI: In semiconductor and pharmaceutical water systems, Neosepta CMX is frequently used in EDI stacks. The membranes have an exceptionally smooth surface, which prevents "dead spots" where ions could trap and scale, ensuring the system can reach the 18.2 MΩ·m resistivity required for chip manufacturing.
Lithium Brine Concentration: ASTOM membranes are also central to the lithium supply chain by concentrating Lithium Chloride (LiCl) or Lithium Sulfate (Li2SO4) from brines. The CMS (Monovalent Selective) membrane allows lithium to be separated from divalent impurities like Magnesium, which is the "holy grail" of efficient lithium extraction.
Salt Production (Seawater): Japan produces nearly all its domestic salt using ASTOM membranes to concentrate seawater. Using CMS and ACS membranes, they produce a highly concentrated NaCl brine (200-250 g/L) while preventing heavy metals or gypsum from contaminating the salt.
| Part Number |
CEEANAEMASE |
CEEANCEMAHA |
CEEANCEMCAXPD |
| Membrane Series Number |
ASE (strong base, Cl type) |
AHA (strong base, Cl type) |
AXP-D (strong base, Cl type) |
| Characteristics |
High mechanical strength |
High Mechanical strength/Alkali Resistance |
Monovalent anion permselectivity |
| Electric Resistance (Ω cm2) |
2.0 |
4.1 |
2.5 |
| Burst Strength (MPa) |
≥0.35 |
≥0.90 |
≥0.20 |
| Thickness (mm) |
0.15 |
0.22 |
0.10 |
| Operation Conditions |
T≤40°C, pH: 0-14 |
T≤60°C, pH: 0-14 |
T≤40°C, pH: 0-10 |
| Application |
|
|
|
| Package Grade |
10cm*10cm/pcs/pack (a larger size can be supplied upon request) |
10cm*10cm /pcs/pack (a larger size can be supplied upon request) |
10cm*10cm /pcs/pack (a larger size can be supplied upon request) |
Note: All the cation-exchange membranes should be immersed in a 3-5% NaCl solution before use. Please keep it in a hydrated condition.
Reference:
- B. Wang , et al., Ionic liquid-based pore-filling anion-exchange membranes enable fast large-sized metallic anion migration in electrodialysis, J. Membrane Sci., 2023, 670, 121348.
- M. M. Alam, et al., An alkaline stable anion exchange membrane for electro-desalination, Desalination. 2021, 497, 114779.