Efficiency
Ohmic loss
Ionic resistance is power paid for on every kilogram of hydrogen.
0.2Ω·cm²Nerva H2Sep 500 ionic resistance
Advanced separators for alkaline electrolysers
The membranes powering the green hydrogen economy.
Nerva H2Sep 500 lets every electrolyser stack make more hydrogen from the same cell voltage, in a stronger sheet that drops into today's 500 µm-class designs. Developed at IIT Bombay. Made in India for electrolyser makers worldwide.
- +38%*cell current at 2.4 V
- 2.7×*tensile strength
- 0.2Ω·cm² ionic resistance
* Compared with a commercial 500 µm-class separator in IIT Bombay lab tests. Typical values, not a specification.
0
0
- Developed at IIT Bombay
- Incubated at SINE, IIT Bombay
- Validated against a commercial reference
- Designed and made in India
Validated performance
More hydrogen from every stack
Nerva H2Sep 500, measured against a commercial 500 µm-class separator in the same alkaline electrolyser cell.
The technology+38%cell current vs the commercial reference at 2.4 V
2.7×tensile strength
0.2 Ω·cm²ionic resistance
Indiadesigned and made in India
Head to head
Nerva H2Sep™ 500 vs a commercial 500 µm-class separator
| Property | Nerva H2Sep 500 | Commercial reference | Advantage |
|---|---|---|---|
| Cell current at 2.4 V, room temperature | ~2.00 A | ~1.45 A | +38% |
| Cell current at 2.4 V, 80 °C | ~2.65 A | ~2.10 A | +26% |
| Tensile strength | ≈ 65 MPa | ≈ 24 MPa | ≈ 2.7× |
| Young's modulus | > 600 MPa | 310 MPa | ≈ 2× |
| Thickness | 430 ± 30 µm | 500 ± 50 µm | Thinner, same format |
| Bubble point | 2.5 ± 1 bar | 2 ± 1 bar | Comparable or better |
| Max. operating temperature | 100 °C | 110 °C | Reference higher |
| Made in | India | Imported | Domestic value addition in India |
Measured at IIT Bombay against a commercial 500 µm-class reference. Typical values, not a specification. Reference values measured on the same rig or taken from the reference manufacturer's published data.
The problem
The separator sets an electrolyser's efficiency, gas purity and life. India imports almost all of it.
Gas purity
Separation
Bubble point and pore structure keep H₂ and O₂ apart under pressure.
2.5 ± 1barNerva H2Sep 500 bubble point
Durability
Mechanical life
Strength decides behaviour in assembly, thermal cycling and pressure swings.
≈ 65MPatensile strength, ~2.7× the reference
Supply
Import dependence
Premium separators are concentrated in very few suppliers: a lead-time, price and policy risk for stack makers everywhere.
Made in IndiaNerva H2Sep 500, for electrolyser makers worldwide
How the separator worksValues are typical, measured at IIT Bombay; not a specification.
Our answer · available now
Nerva H2Sep™ 500
A nanomaterial-modified zirconia–polymer composite separator and a drop-in for 500 µm-class stacks: no re-tooling of frames or gaskets.
- Thickness
- 430 ± 30 µm
- Ionic resistance
- 0.2 Ω·cm²
- Bubble point
- 2.5 ± 1 bar
- Operation
- up to 100 °C
- Samples
- A4 sheets now
- Origin
- Made in Indiaभारत में निर्मित
Current vs potential, room temperature
Same alkaline electrolyser cell · lab data
Nerva H2Sep 500Commercial 500 µm reference
Who it's for
Built for the people who make and run electrolysers
For electrolyser makers, project developers and EPCs in India, Europe and the Middle East.
Electrolyser makers
Higher current density from every stack
R&D, stack engineering, quality and procurement teams specifying a higher-performance separator.
Developers and operators
Lower power per kilogram of hydrogen
Hydrogen developers, EPCs and plant operators specifying the stacks in their projects.
International stack makers
Beyond the premium benchmark
Stack makers in Europe and the Middle East who specify on performance: +38% current and ~2.7× the strength of a premium composite reference.
How we work
Samples in two weeks. Then trials. Then supply.
A structured programme that ends in a decision, with our engineers alongside yours at every step.
- 01
Technical exchange
Data and test conditions under NDA, and a qualification protocol for your stack.
- 02
Samples
A4 sheets, or your sizes on request, with a certificate of analysis.
- 03
Trials
Cell and short-stack tests on your bench at your operating conditions.
- 04
Supply agreement
Pilot supply, design-in and a supply agreement with on-site support.
Why now
India has moved from hydrogen targets to signed contracts
The electrolysers behind India's green hydrogen mission are being bought now, and their core components are still imported.
5 MMTof green hydrogen a year by 2030 under the National Green Hydrogen Mission
A decade-long build-out of 60–100 GW of electrolysers
India's green hydrogen goal needs a domestic electrolyser industry at scale, and every electrolyser needs a separator, electrodes and a stack built around them.
Why India, why now
Sources: MNRE; Business Standard / MNRE (24 Sep 2026); IEA Global Hydrogen Review 2025; Dalberg / Bharat Climate Forum (Mar 2026).
Across the alkaline value chain
One company for the parts that decide how an electrolyser performs
India's electrolysers are being bought now, and the components that decide their performance are still largely imported. We make them in India, for electrolyser makers here and worldwide.
- 01
Replace imports
Nerva H2Sep 500 gives Indian electrolyser makers a separator that outperforms the commercial benchmark in cell tests, made here and supporting domestic-content requirements.
Why Greenprastha - 02
Supply the world
The same datasheet-backed performance, quality system and lot traceability for stack makers in Europe, the Middle East and beyond.
Quality & traceability - 03
Cover the whole cell
From the separator outwards: matched electrodes, zero-gap assemblies, replacement programmes and testing, on one materials science and one quality system.
What's coming next
From the separator to the complete cell
The parts that decide how a cell performs
One materials science, one quality system, the same customers. Each product is released only when it has been proven with them.
Rooted in IIT Bombay's membrane research
India's membrane science, built into an industrial product
In 2024 IIT Bombay set up the Gogri Hub for Membranes Research to address the absence of domestic membrane development and manufacturing in India. Ion-conducting membranes for alkaline water electrolysis are part of its programme. Our co-founder, Prof. Swatantra Pratap Singh, is the Hub's first Professor-in-Charge, and Nerva H2Sep 500 was developed in his research programme.
- Gogri Hub for Membranes Research, IIT Bombay: inaugurated April 2024 with support from IIT Bombay alumni
- Incubated at SINE, IIT Bombay's technology business incubator
- Recognised research: European Membrane Society, INAE and INSA honours; 5,000+ citations
- Industrial discipline: tested on the same rig as the reference, with a quality system for every roll
Leadership
The founders
Prof. Swatantra Pratap Singh
Co-founderLeads science and technology: separator R&D, the product roadmap and technical validation with customers.
Professor at IIT Bombay and Professor-in-Charge of its Gogri Hub for Membranes Research. The inventor of the membrane technology Greenprastha is built on.
Ravi Verma
Co-founderLeads strategy, customer partnerships and market development in India and abroad.
Two decades leading brands at Raymond (Park Avenue), Tata Motors, Mahindra and General Motors; CMO Asia 100 Most Influential Marketing Leaders.
Pawan Kumar
Co-founderLeads product and manufacturing: process development, scale-up, testing and quality.
Co-inventor on a 2024 patent application for single-step graphene-based membrane-electrode assemblies.
Work with Greenprastha
Start where you are
CustomersEvaluate Nerva H2Sep 500Samples, the datasheet and a qualification protocol for your stack.How qualification works
PartnersBuild the value chain with usCo-development, regional partnerships, research and supply-chain collaborations.Partner with usInvestorsThe case for GreenprasthaThe market, our product advantage and the platform across the alkaline cell.Information for investorsStart an evaluation
Test Nerva H2Sep 500 in your stack.
A4 samples ship in about two weeks, with a certificate of analysis and a qualification protocol for your stack.