HDRX-068-H2
A certified, flight-weight hydrogen storage cylinder for fuel-cell UAVs and hydrogen R&D programmes: ≈160 g of usable H₂ in a 2.8 kg tank, certificate issued to EN ISO 12245:2022, CE marked, built on our sealed liner with no measurable permeation — also available as the helium twin HDRX-068-HE. Development is complete; the first production batch ships mid-September.
A certified 350 bar hydrogen cylinder you can actually buy at R&D quantities.
The HDRX-068-H2 is a Type IV composite overwrapped pressure vessel (COPV) purpose-built for hydrogen: a polymer liner for permeation control inside a full carbon-fibre overwrap, holding 6.8 litres of water volume at 350 bar — about 160 grams of usable hydrogen — in a tank that weighs 2.8 kg empty. That gravimetric ratio of 57 g H₂ per kg of tank is what turns a fuel-cell powertrain from a science project into a flight-time advantage.
Unlike most flight-weight hydrogen tanks on the market, this one arrives with its paperwork finished: the certificate to EN ISO 12245:2022 is issued and the cylinder is CE marked (CE covers the 6.8 L and 40 L H₂/He models; certification of the larger sizes is pending), so your safety officer, insurer and logistics chain get a document set they recognise. It fills at the 350-bar (H35) tier used across hydrogen mobility, mates to common regulator threads, and ships in single units for fuel-cell UAV programmes, hydrogen R&D benches and demonstrator vehicles alike. Not sure it’s the right size? Compare the full COPV range or run your airframe numbers in the mass & performance calculator.
Technical specification
Full specification as certified. Need the numbers in your CAD or a slide deck? Grab the datasheet PDF and 3D STEP model below.
| Part number | HDRX-068-H2 |
|---|---|
| Type | Type IV composite overwrapped pressure vessel (polymer liner, full carbon-fibre overwrap) |
| Certification | EN ISO 12245:2022 — certificate issued · CE marked Transportable composite cylinders for hydrogen service. CE covers the 6.8 L and 40 L H₂/He models; larger sizes pending. |
| Liner | MEYER sealed liner — no measurable H₂/He permeation Type-1-grade gas-tightness at Type IV weight, verified by helium leak detection — read the announcement. |
| Gas service | Hydrogen (H₂) |
| Water volume | 6.8 L |
| Working pressure | 350 bar |
| Test / burst pressure | 450 bar test (PT/PH) · ≥900 bar minimum burst |
| Temperature range | −40 °C to +60 °C (374 bar max working pressure at 60 °C; mounting torque per EN ISO 13341; do not pull vacuum) |
| Hydrogen capacity | ≈160 g H₂ at 350 bar / 15 °C (≈5.3 kWh chemical energy, LHV) |
| Empty weight | 2.8 kg (57 g H₂ per kg of tank — see the drone tank weight ranking) |
| Diameter × length | 158 mm × 526 mm |
| Neck thread | M18×1.5 (EN 144-1) standard · 17E (EN ISO 11363-1) · 5/8″-18 UNF (ANSI B1.1) 25E, 3/4″-16 UNF and M12×1 on request |
| Service life | Designed NLL (no limited lifespan) · certified service life 20 years, subject to periodic inspection |
| Designed & tested | Hydrostatic, burst, ambient cycling, permeation and drop testing per EN ISO 12245:2022 qualification programme |
| Availability | Pre-order — first batch ships mid-September; second batch Q1–Q2 2027 |
Rendered from the released drawing — dimensions and tolerances per the datasheet drawing. The STEP model is an untoleranced reference envelope for CAD integration.
↓ Get the datasheet & STEP modelWho it’s built for
One cylinder, two very different missions — the common thread is weight-critical hydrogen with paperwork your programme office will accept.
Fuel-cell UAVs & drones
Battery endurance is the wall every multirotor and fixed-wing programme hits. Hydrogen moves it:
→ ≈ 2.5–2.9 kWh electric through a typical PEM stack
→ the same electric energy in Li-ion cells alone would weigh ≈10–13 kg — this tank, full, weighs under 3 kg
At 158 mm diameter it packages into most 25 kg+ airframes, and 350 bar — the H35 refuelling tier used across hydrogen mobility — packs more gas into the same envelope than legacy 300-bar designs.
Hydrogen R&D programmes
For fuel-cell test benches, demonstrator vehicles and lab-scale hydrogen systems, the blocker is rarely the stack — it’s sourcing a certified, transportable cylinder at prototype quantities without a 40-week automotive procurement cycle.
- Certificate issued to EN ISO 12245:2022 — a document set your safety officer and insurer can sign off.
- Transportable — fill it at your gas supplier, move it between bench and vehicle, ship it between sites.
- Prototype-friendly quantities — order one, or reserve a batch; no platform-programme MOQs.
- Thread flexibility — mate it to your existing regulator or develop the pair with us.
Working toward vehicle homologation? Start with the regulatory landscape: EC79 was repealed in 2022 — here’s what replaced it, and EN 17339 explained.
How long would it fly on your aircraft?
Set your platform’s continuous electrical power draw — the estimate updates from this tank’s real ≈160 g H₂ capacity.
Tank-energy estimate: ≈160 g H₂ × 33.3 kWh/kg (LHV) × stack efficiency ÷ your power draw. Excludes fuel-cell stack and regulator mass — for full system-level trade-offs run the mass & performance calculator.
Pick your 6.8-litre variant
Same 158 × 526 mm envelope, three duty points.
| HDRX-068 | HDRX-068-H2 ← this page | HDRX-068-HE | HDRX-068-H2-UL | |
|---|---|---|---|---|
| Gas service | Air / inert gases | Hydrogen | Helium | Hydrogen |
| Working pressure | 300 bar | 350 bar | 350 bar | 350 bar |
| Weight | 2.8 kg | 2.8 kg | 2.8 kg | 2.3 kg |
| Certification | TPED · CE · ISO 11119-3 | EN ISO 12245:2022 · CE | EN 12245 · π · CE · ISO | In qualification |
| Service life | NLL | 20 yr | 20 yr | 20 yr (target) |
| Status | In stock — order | Pre-order open | Order via catalog | In qualification — get notified |
HDRX-068-H2 This page
- Gas serviceHydrogen
- Pressure350 bar
- Weight2.8 kg
- CertificationEN ISO 12245:2022 · CE
- Service life20 yr
HDRX-068
- Gas serviceAir / inert gases
- Pressure300 bar
- Weight2.8 kg
- CertificationTPED · CE · ISO 11119-3
- Service lifeNLL
HDRX-068-HE
- Gas serviceHelium
- Pressure350 bar
- Weight2.8 kg
- CertificationEN 12245 · π · CE · ISO
- Service life20 yr
HDRX-068-H2-UL
- Gas serviceHydrogen
- Pressure350 bar
- Weight2.3 kg
- CertificationIn qualification
- Service life20 yr (target)
Flying it? Pair it with the HDRX-R450 hydrogen regulator.
A cylinder is half the fuel system. The HDRX-R450 fuel-cell drone regulator is designed for exactly this class of tank — or we develop and validate the cylinder–regulator pair together so integration risk is ours, not yours.
How pre-ordering works
No payment now, no obligation — a pre-order reserves your place in the production queue.
Request your slot
Submit the pre-order form with quantity, thread and target date. Takes two minutes; nothing is binding yet.
Proforma in 3 working days
Meyer sales replies with unit pricing for your quantity, a confirmed delivery date and a proforma invoice.
Confirm & we build
Confirm the proforma and your cylinders are allocated to the batch. First come, first allocated.
Batch 2 — Q1–Q2 2027. Pre-orders received after Batch 1 fills are allocated here.
Datasheet & 3D STEP model
For your design review and CAD integration. Tell us where to send them and the downloads unlock immediately.
We’ll also email you copies — our mail can take a few minutes, so the links unlock right here too.
We use your email to send the files and product-availability updates for this cylinder. No consent box ticked = no marketing. See it as a handshake, not a mailing list ambush.
Embed this product
Integrator, distributor or writing about hydrogen UAS? Drop this card into your page — it always shows the current status and links back here.
<iframe src="https://meyer.cd/embed/hdrx-068-h2/" width="100%" height="240" style="border:1px solid #ededed;max-width:720px;" title="MEYER HDRX-068-H2 hydrogen cylinder" loading="lazy"></iframe>
Machine-readable specs for shops and BOM tools: JSON catalog feed.
Frequently asked questions
Is the HDRX-068-H2 actually certified, or still in testing?
When will my pre-order be delivered?
How much does it cost?
How much flight time does 160 g of hydrogen buy?
Can it store hydrogen long-term without pressure loss?
Which threads and regulators does it work with?
What about the 2.3 kg ultra-light version?
Can I order a single cylinder for an R&D programme?
What documentation comes with the cylinder?
Batch 1 ships mid-September. Slots are limited.
Reserve now, decide when you see the proforma — or browse the full COPV range and use the selector if you’re not sure this is your cylinder.
MEYER® designs and qualifies composite pressure vessels for weight-critical mobile applications. Specifications subject to the certificate documentation; always verify fit with the dimensioned drawing in the datasheet. Need a different size, pressure or geometry? Open a custom RFQ.
