How much hydrogen does the HDRX-3500-H2 store?

Approximately 8.3 kg of hydrogen at 350 bar working pressure and 15 °C, a gravimetric efficiency of 12.7%.

Does the HDRX-3500-H2 lose hydrogen through the liner?

No measurable hydrogen permeation was found in qualification, verified by helium leak detection — the MEYER sealed liner closes the permeation path that standard polymer liners have.

What certification does the HDRX-3500-H2 carry?

Hydrogen models are CE marked (this model is in development — certification on completion of qualification). Burst pressure is 3× working pressure.

Can the HDRX-3500-H2 be ordered at a lower safety factor than 3.0?

Yes. Catalog ratings use a burst safety factor of 3.0; for R&D and qualification-by-project programs the same structure is quoted at customer-selected safety factors (e.g. SF 2.5, SF 2.25, SF 2.0) with the working pressure derived as burst ÷ SF — ordered as HDRX-3500-H2-SF2.5 and so on. Derived ratings are engineering configurations, not certified ratings.

Catalog › Hydrogen › HDRX-3500-H2Deutsche Version →

HDRX-3500-H2 — 350 L hydrogen composite cylinder, 350 bar

H2DEV

In development — technical inquiry welcome

The HDRX-3500-H2 is a 350 L Type IV composite hydrogen cylinder rated at 350 bar (5000 psi) built on the MEYER sealed liner — no measurable hydrogen permeation, verified by helium leak detection. It stores approximately 8.3 kg of hydrogen at 350 bar / 15 °C in a 57 kg cylinder (12.7% gravimetric efficiency). Designed for fuel-cell UAS and weight-critical hydrogen systems; full-composite construction with no metal-fatigue cap on cycle life.

Part No.	Volume	Pressure	Ø Dia	Length	Weight	H₂ / Grav.	Approvals	Lifespan
HDRX-3500-H2	350 L21,358 cu in	350 bar5,000 psi	452 mm17.8 in	1676 mm65.98 in	57.00 kg125.66 lb	8.3 kg · 12.7%	H2DEV	20 yr

Safety factor WP = burst ÷ SF · derived ratings are not certified

350 bar · 5,000 psi

Part number	HDRX-3500-H2
	Metric	Imperial
Working pressure	350 bar	5,000 psi
Burst pressure (3 × WP)	1050 bar	15,000 psi
Water volume	350 L	21,358 cu in
Diameter	Ø 452 mm	Ø 17.8 in
Length	1676 mm	65.98 in
Weight	57.00 kg	125.66 lb
H₂ capacity (at WP / 15 °C)	8.3 kg · 12.7%	18.29 lb
Temperature range	−40 to +60 °C	−40 to +140 °F
Threads	M18×1.5 · 17E · 25E · 3/4″-16 UNF · 5/8″-18 UNF · M12×1 · others on request
Qualification	EN ISO 12245:2022
Service life	20 yr

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R&D configurations — reduced safety factor

Catalog ratings use a burst safety factor of 3.0 (burst = 3 × working pressure). For R&D, space and qualification-by-project programs, the same structure can be operated at a customer-selected safety factor: the burst pressure of 1050 bar is fixed by the structure, and the working pressure is derived as WP = burst ÷ SF. Derived ratings are engineering references — CE/π certification applies at SF 3.0 only.

Safety factor	Part number	Working pressure (metric)	Working pressure (imperial)	Rating
SF 3.0	HDRX-3500-H2	350 bar	5,000 psi	Catalog — certified rating
SF 2.50	HDRX-3500-H2-SF2.5	420 bar	6,000 psi	Engineering configuration — not certified
SF 2.25	HDRX-3500-H2-SF2.25	466.7 bar	6,650 psi	Engineering configuration — not certified
SF 2.0	HDRX-3500-H2-SF2	525 bar	7,500 psi	Engineering configuration — not certified

Click a configuration to select it — the drawing caption, specification and the request buttons above will reference that exact configuration.

Any factor from 1.5 to 10 can be configured in the catalog R&D view — quotes carry the -SF suffix automatically.

Other configurations of the HDRX-3500

HDRX-3500-HE

Related hydrogen cylinders

HDRX-1200-H2 HDRX-400-H2 HDRX-090-H2 HDRX-068-H2

Frequently asked questions

How much hydrogen does the HDRX-3500-H2 store?: Approximately 8.3 kg of hydrogen at 350 bar working pressure and 15 °C, a gravimetric efficiency of 12.7%.
Does the HDRX-3500-H2 lose hydrogen through the liner?: No measurable hydrogen permeation was found in qualification, verified by helium leak detection — the MEYER sealed liner closes the permeation path that standard polymer liners have.
What certification does the HDRX-3500-H2 carry?: Hydrogen models are CE marked (this model is in development — certification on completion of qualification). Burst pressure is 3× working pressure.
Can the HDRX-3500-H2 be ordered at a lower safety factor than 3.0?: Yes. Catalog ratings use a burst safety factor of 3.0; for R&D and qualification-by-project programs the same structure is quoted at customer-selected safety factors (e.g. SF 2.5, SF 2.25, SF 2.0) with the working pressure derived as burst ÷ SF — ordered as HDRX-3500-H2-SF2.5 and so on. Derived ratings are engineering configurations, not certified ratings.