How long does the HDRX-068-HE hold helium?

Qualification testing found no measurable helium permeation, verified by helium leak detection. Unlike standard polymer-lined composite cylinders, stored helium stays stored.

Why use a composite cylinder for helium instead of steel?

The HDRX-068-HE weighs 2.8 kg — typically a third of the equivalent metal cylinder — with the same gas-tightness, thanks to the MEYER sealed liner.

What approvals do MEYER helium cylinders carry?

Helium models carry π (TPED), CE and ISO 11119-3 approvals; the 6.8 L and 40 L sizes are certified, remaining sizes are completing qualification.

Can the HDRX-068-HE 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-068-HE-SF2.5 and so on. Derived ratings are engineering configurations, not certified ratings.

Catalog › Helium › HDRX-068-HEDeutsche Version →

HDRX-068-HE — 6.8 L helium composite cylinder, 350 bar

πCEISOHEDEVPRE-ORDER

Pre-orders open — development in final phase

The HDRX-068-HE is a 6.8 L Type IV composite helium cylinder rated at 350 bar (5000 psi) built on the MEYER sealed liner — no measurable helium permeation, verified by helium leak detection. Helium is the industry's most escape-prone gas; the sealed liner keeps it stored in a full-composite cylinder of just 2.8 kg, for satellite pressurant systems, tracer-gas rigs, lighter-than-air platforms and research.

Part No.	Volume	Pressure	Ø Dia	Length	Weight	H₂ / Grav.	Approvals	Lifespan
HDRX-068-HE	6.8 L415 cu in	350 bar5,000 psi	158 mm6.22 in	526 mm20.71 in	2.80 kg6.17 lb	—	πCEISOHEDEVPRE-ORDER	20 yr

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

350 bar · 5,000 psi

Part number	HDRX-068-HE
	Metric	Imperial
Working pressure	350 bar	5,000 psi
Burst pressure (3 × WP)	1050 bar	15,000 psi
Water volume	6.8 L	415 cu in
Diameter	Ø 158 mm	Ø 6.22 in
Length	526 mm	20.71 in
Weight	2.80 kg	6.17 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 12245:2022 (He service)
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-068-HE	350 bar	5,000 psi	Catalog — certified rating
SF 2.50	HDRX-068-HE-SF2.5	420 bar	6,000 psi	Engineering configuration — not certified
SF 2.25	HDRX-068-HE-SF2.25	466.7 bar	6,650 psi	Engineering configuration — not certified
SF 2.0	HDRX-068-HE-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-068

HDRX-068-H2 HDRX-068-H2-UL HDRX-068-HE-UL HDRX-068 HDRX-068-MIL

Related helium cylinders

HDRX-068-HE-UL HDRX-090-HE HDRX-043-HE HDRX-030-HE

Frequently asked questions

How long does the HDRX-068-HE hold helium?: Qualification testing found no measurable helium permeation, verified by helium leak detection. Unlike standard polymer-lined composite cylinders, stored helium stays stored.
Why use a composite cylinder for helium instead of steel?: The HDRX-068-HE weighs 2.8 kg — typically a third of the equivalent metal cylinder — with the same gas-tightness, thanks to the MEYER sealed liner.
What approvals do MEYER helium cylinders carry?: Helium models carry π (TPED), CE and ISO 11119-3 approvals; the 6.8 L and 40 L sizes are certified, remaining sizes are completing qualification.
Can the HDRX-068-HE 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-068-HE-SF2.5 and so on. Derived ratings are engineering configurations, not certified ratings.