Carbon-composite hydrogen cylinder HDRX-068-H2 with red domes, 6.8 L / 350 bar

HDRX-068-H2 — 6.8 L / 350 bar Certified Hydrogen Cylinder

Certified Hydrogen COPV — Pre-Order Open

HDRX-068-H2

6.8 L·350 bar·Type IV composite hydrogen cylinder
EN ISO 12245:2022 CE H2 SEALED LINER PRE-ORDER

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.

Datasheet & 3D STEP Model ↓ Pre-orders are non-binding until you confirm our proforma invoice — pricing and delivery date within 3 working days.
HDRX-068-H2 — carbon-composite hydrogen cylinder with red domes, 6.8 L / 350 bar
Usable H₂≈160 gat 350 bar, 15 °C
Tank weight2.8 kg57 g H₂ per kg tank
Working pressure350 barType IV COPV
Envelope158 × 526mm, Ø × length
Service life20 yrEN ISO 12245:2022

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 numberHDRX-068-H2
TypeType IV composite overwrapped pressure vessel (polymer liner, full carbon-fibre overwrap)
CertificationEN 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.
LinerMEYER 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 serviceHydrogen (H₂)
Water volume6.8 L
Working pressure350 bar
Test / burst pressure450 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 weight2.8 kg (57 g H₂ per kg of tank — see the drone tank weight ranking)
Diameter × length158 mm × 526 mm
Neck threadM18×1.5 (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 lifeDesigned NLL (no limited lifespan) · certified service life 20 years, subject to periodic inspection
Designed & testedHydrostatic, burst, ambient cycling, permeation and drop testing per EN ISO 12245:2022 qualification programme
AvailabilityPre-order — first batch ships mid-September; second batch Q1–Q2 2027
HDRX-068-H2 dimensioned technical drawing — composite hydrogen cylinder, 526 mm length, Ø158 mm, Ø36 mm boss

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 model

Who 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:

160 g H₂ × 33.3 kWh/kg (LHV) ≈ 5.3 kWh on board
→ ≈ 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.

W
Fuel-cell efficiency:

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.

Estimated endurance on one fill
3 h 20 min
A LiPo pack of the same weight (≈3.0 kg, 220 Wh/kg) at this draw: ≈49 min — this tank carries ×4.1 the energy.

Pick your 6.8-litre variant

Same 158 × 526 mm envelope, three duty points.

HDRX-068HDRX-068-H2 ← this pageHDRX-068-HEHDRX-068-H2-UL
Gas serviceAir / inert gasesHydrogenHeliumHydrogen
Working pressure300 bar350 bar350 bar350 bar
Weight2.8 kg2.8 kg2.8 kg2.3 kg
CertificationTPED · CE · ISO 11119-3EN ISO 12245:2022 · CEEN 12245 · π · CE · ISOIn qualification
Service lifeNLL20 yr20 yr20 yr (target)
StatusIn stock — orderPre-order openOrder via catalogIn qualification — get notified
HDRX-068-H2 This page
  • Gas serviceHydrogen
  • Pressure350 bar
  • Weight2.8 kg
  • CertificationEN ISO 12245:2022 · CE
  • Service life20 yr
Pre-order open — batch 1 ships mid-September
HDRX-068
  • Gas serviceAir / inert gases
  • Pressure300 bar
  • Weight2.8 kg
  • CertificationTPED · CE · ISO 11119-3
  • Service lifeNLL
In stock — order →
HDRX-068-HE
  • Gas serviceHelium
  • Pressure350 bar
  • Weight2.8 kg
  • CertificationEN 12245 · π · CE · ISO
  • Service life20 yr
Order via catalog →
HDRX-068-H2-UL
  • Gas serviceHydrogen
  • Pressure350 bar
  • Weight2.3 kg
  • CertificationIn qualification
  • Service life20 yr (target)
In qualification — get notified →

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.

See the regulator →

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 1 — ships mid-September. Limited quantity; slots are allocated in the order pre-orders are confirmed.
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.

HDRX-068-H2 datasheet (PDF)Full certified specification, dimensioned drawing and ordering options — formatted for design reviews.
3D model (STEP)Reference outer envelope with neck detail for CAD integration — dimensions and tolerances per the datasheet drawing.

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?
Certified. The qualification programme is complete, the certificate to EN ISO 12245:2022 has been issued, and the cylinder is CE marked. The 6.8 L and 40 L hydrogen and helium models carry CE; certification of the 120 L and 350 L models is pending. The certificate documentation ships with every cylinder and is available to pre-order customers on request.
When will my pre-order be delivered?
The first production batch ships mid-September and is allocated in the order pre-orders are confirmed. Once Batch 1 is fully allocated, subsequent pre-orders are scheduled for Batch 2 in Q1–Q2 2027. Your proforma invoice states your confirmed delivery date before you commit.
How much does it cost?
Pricing depends on quantity and configuration (thread, valve options), so we quote per order: submit a pre-order request and you’ll receive unit pricing and a proforma invoice within 3 working days. The request is free and non-binding.
How much flight time does 160 g of hydrogen buy?
Depends on your airframe and stack, but the energy math is: ≈5.3 kWh chemical (LHV), roughly 2.5–2.9 kWh electric after a typical PEM fuel cell — energy that would take ≈10–13 kg of Li-ion cells. Multirotor programmes typically see 2–3× battery endurance at system level. Run your own numbers in the mass & performance calculator.
Can it store hydrogen long-term without pressure loss?
Yes — this is what sets the 2026 range apart. The HDRX-068-H2 is built on the MEYER sealed liner, which shows no measurable hydrogen or helium permeation (verified by helium leak detection). Where classic polymer-lined composite cylinders lose pressure over weeks, this one holds its fill — for standby systems, remote assets and long campaigns. Compare liner loss rates in the permeation calculator.
Which threads and regulators does it work with?
M18×1.5 is standard; 17E, 25E, 3/4″-16 UNF, 5/8″-18 UNF and M12×1 are available on request. It pairs with hydrogen-rated regulators such as our HDRX-R450 fuel-cell drone regulator, or we can develop and validate the cylinder–regulator pair together.
What about the 2.3 kg ultra-light version?
The HDRX-068-H2-UL shares this cylinder’s exact 158 × 526 mm envelope but targets 2.3 kg — about 70 g of H₂ per kg of tank. It is in qualification. Tick the UL box in the download form above and we’ll notify you the moment it becomes orderable.
Can I order a single cylinder for an R&D programme?
Yes. R&D benches, university programmes and prototype airframes regularly start with one or two units — note your application in the pre-order request and we’ll quote accordingly. Volume pricing scales from there for fleet and production programmes.
What documentation comes with the cylinder?
Each cylinder is delivered with its certificate documentation per EN ISO 12245:2022. Qualification and test documentation for design reviews is available to customers on request — ask when you pre-order.
Can I use it for gases other than hydrogen?
It’s designed and certified for hydrogen service. For breathing air, helium or nitrogen in the same envelope, the HDRX-068 (NLL service life, in stock) is the better fit — or ask us about your specific medium.

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.

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