Harmonization Code : 3920.99.53 |   Other plates, sheets, film, foil and strip, of plastics, non-cellular and not reinforced, laminated, supported or similarly combined with other materials ; Of other plastics ; Ion-exchange membranes of fluorinated plastic material, for use in chlor-alkali electrolytic cells
Main features
  • Water Electrolysis
  • Acid Recovery and Salt Splitting
  • 70 micron thick membrane with woven PEEK reinforcement

Product Description

AEMION+™-AF3-HWC9-70 is a breakthrough advanced polyimidazolium-based ion exchange membrane that enables the rapid growth of the hydrogen economy. Ionomr's Aemion+® anion exchange membranes are significantly more durable than our competitors', leading to thinner membranes, longer service life and reduced overall system costs.

AEMION+™ membranes have low ionic resistance and high electrical resistance. They are the first available commercial materials with excellent chemical stability in solutions of both high and low pH, and even in the harshest alkaline electrolysis systems (2–3M KOH, 80-100 °C). These advanced anion exchange membranes are frontiers in materials science with their unique hydrocarbon structure and good mechanical strength. All of these desirable properties unlock other potential applications that were previously constrained by the membrane’s poor durability and integrity. AEMION+™ is the enabling, platform material for the scale-up of AEMWE technology to industrial level.

AEMION+™-AF3-HWC9-70 is the thinner version of AEMION+™ - AF3-HWK9-75. The thickness of ion exchange membranes plays a crucial role in the performance and efficiency of water electrolyzers and fuel cells. Generally, thinner membranes are often preferred to maximize conductivity and efficiency. Therefore, thin membranes are more suitable in applications where high power density and rapid response are more critical. On the other hand, thicker membranes are preferred or applications requiring long-term stability and robustness. Optimizing the membrane thickness to your specific electrochemical process and operating conditions is the key to unlocking optimal performance.

With its excellent chemical stability at the full pH spectrum (0–14), AEMION+™-AF3-HWC9-70 can also be used in acid receovery and salt splitting applications. Aemion+® anion exchange membranes exhibit high oxidative tolerance, selectivity, and extended maintenance cycles, contributing to extended system lifetimes. AEMION+™-AF3-HWC9-70  demonstrates slightly lower proton blocking at high acid concentrations compared to other purpose-built AEMs. Still, it demonstrates significantly lower resistance and total power consumption per mole of acid, making them effective in concentrating applications (i.e., removal of total sulfate to 0 from a stream), and in use for acid concentration up to 5–7 wt%. 

Product Family
20 x 30 cm 32 x 312.5 cm
Roll Membrane

Catalog Product

Unlike other products we offer, the products listed on this page cannot currently be ordered directly from the website.

Technical Specifications

Additional Information

Non Disclosure Agreement

This is a proprietary product from Ionomr, therefore, we require a signed NDA between the end customer and Ionomr before we are able to ship out the material, either for commercial use, or research.

This is done to prevent reverse engineering and public disclosure. The NDA does not restrict patenting anything, but does include the physical materials and their composition as confidential which prevents specific disclosure in a patent or otherwise but not calling out use of an AEM including Aemion by trade name. The test results are included as confidential information, and require  approval from both parties to disclose. We are not concerned about blocking any publications, but would typically advise if we believe better results can be achieved.

We have a more explicit MTA (Materials Transfer Agreement) we use with academic/research organizations which outlines more detail around materials IP and publication.

Please find the NDA here and fill it in when contacting us for quotations.

AEMION+® Anion Exchange Membranes Enable Large-scale Commercial Development

Alkaline water electrolysis (AWE) is the most mature technology that has been used extensively over the past decades. In this configuration, a liquid caustic electrolyte solution, most commonly NaOH and KOH, is pumped into the system composed of electrodes separated by a porous diaphragm. While AWE is a low-cost technology owing to its propensity for cheap catalysts, it suffers from large internal resistance between the diaphragm and liquid electrolyte. It typically operates under low current densities, which consequently requires bulky stack configurations at larger scales.

To make the electrolyzer design more compact, proton exchange membranes are used instead of the liquid electrolyte in AWE. Instead of OH ions in AWE, H+ ions are the mobile carriers in proton exchange membrane water electrolysis (PEMWE). H+ ions exhibit significantly better ionic conductivity than OH, which makes the achieved efficiency of PEMWE higher than that of AWE. On top of that, the more compact design of PEMWE makes it able to operate even under high current densities. The caveat? Since PEMWE operates under highly acidic conditions, the catalysts that can be used are often limited to platinum group metals, increasing the CAPEX and OPEX of PEMWEs. 


Advantages and Disadvantages of AWE, PEMWE, and AEMWE
This has got scientists and engineers thinking. We should have a technology that combines the advantages of AWE and PEMWE, a technology that enables a compact configuration and does not require the use of PGM metal catalysts. Alkaline anion exchange membrane water electrolysis (AAEMWE) is an emerging technology that uses an anion exchange membrane, therefore, bridging the possibility of using low-cost catalysts while maintaining a compact, zero-gap water electrolyzer structure.

At their current scale, the CAPEX of AWE and PEMWE are way above the targets set by the US Department of Energy. Low CAPEX water electrolysis systems like AAEMWE makes it possible for green hydrogen production technologies to become more competitive against the traditional steam reforming process. Following this thought, developing high-performance and stable alkaline anion exchange membranes facilitates the growth of a sustainable hydrogen economy. 


In the white paper, “Hydrogen Production Cost by AEMION+®,” the investment costs of AEMWE systems at scales comparable to those of the most recent industrial-scale AWE and PEMWE deployments. The investment costs of five water electrolyzer configurations were compared.

At 1 MW scale, the investment costs for AWE ($1279/kW) and PEMWE ($1168/kW) systems are quite similar. Meanwhile, the costs for AEMWE systems using AEMION+® are considerably lower at   $931/kW and  $926/kW without and with PGM catalysts. At a larger economy of scale, at 5 MW, the costs for all five technologies were all lower. More importantly, the costs for the AEMWE systems are still the lowest ($444/kW and  $459/kW).

Without a doubt, the pathway towards low cost and sustainable water electrolysis is possible with further developments in AEMWE technologies. Using Ionomr Innovations' Aemion+TM membrane, AEM stability has increased to the point where large-scale commercial development is possible, and performance may be improved based on a stable platform to approach PEMWE. Ionomr is partnering with industry players and research institutes throughout the world to scale up this technology and thoroughly evaluate its durability and performance in order to demonstrate AEMWE's value proposition for the provision of energy-efficient and low-cost green hydrogen. 


Zero Degradation Found in Latest Test of Aemion+® Alkaline Membrane, Exceeds 2024 Targets


A large-format electrolyzer with an active area of 50 cm2 was assembled using Aemion+® membranes and high-quality alkaline electrodes that have an extended lifespan of up to 20 years. Using these high-quality electrodes allows the assessment of membrane durability without being influenced by the catalyst layer.

The current trial has been ongoing for 2500 hours at the 2024 EU target current density (0.6 A/cm2). The current testing phase builds upon previous durability assessments conducted on Aemion+® membranes. These membranes have successfully operated for over 7500 hours, experiencing minimal system degradation of less than 0.6% per 1000 hours after the initial break-in period, and a total degradation rate of 1.2% per 1000 hours. Furthermore, they have maintained membrane integrity with less than 0.05% measurable degradation per 1000 hours.



The test results revealed remarkably low degradation rates for the electrolyzer, setting a new standard for anion exchange membrane (AEM) technology. This marks the first successful demonstration of stability for anion exchange membrane water electrolyzers (AEMWE) under real-world conditions crucial for large-scale hydrogen production. The cells exhibited no detectable membrane degradation (less than 0.05%), with total system degradation rates (including membrane, catalyst, and flow field) of less than 0.4% per 1000 hours. These results significantly surpass the target set by the EU’s Clean Hydrogen Joint Undertaking Work Programme 2022, which aimed for a measurable system degradation rate of 0.9% per 1000 hours by 2024.

Additionally, most of the system degradation stemmed from the electrodes or the porous metal components responsible for gas and liquid transport. To address this, the porous metal element was removed in the current test, resulting in improved outcomes. Ionomr continues its optimization efforts in collaboration with the National Renewable Energy Laboratory (NREL) as part of the Shell GCxN program. According to Shaun Alia, a staff scientist at NREL, Ionomr membrane electrode assemblies achieved over 1 A/cm2 at 2 V in a hydroxide electrolyte, eliminating the need for iridium with a nonprecious metal anode. These assemblies maintained performance without losses after over 500 hours of operation. This recent durability data builds upon Ionomr's prior success in demonstrating Aemion+® stability in concentrated potassium hydroxide solutions.

For more details, check the latest press release of IONOMR on the stability of AEMION® membranes here.

AEMION+ ® Reinforced Membranes Handling, Storage, and Pre-treatment Instructions