No Measurable Permeation: The Sealed Liner That Makes MEYER Hydrogen & Helium Cylinders Leak-Tight
Every polymer-lined Type IV cylinder leaks a little — it’s physics, not a defect. Gas dissolves into the liner, diffuses through it, and escapes: for hydrogen at 300+ bar, that has meant losses on the order of tens of percent per month through thin polymer liners; for helium, the industry’s most escape-prone gas, it has meant that composite cylinders were often ruled out entirely and missions flew heavy metal-lined tanks instead. That trade-off is what MEYER’s new sealed liner removes: no measurable hydrogen or helium permeation — verified by helium leak detection — in a MEYER cylinder for hydrogen and helium: full-composite construction with Type 1 gas-tightness, at a fifth of the weight.
The problem: permeation is the tax on lightweight storage
The classification of composite cylinders is a story of what sits between the gas and the carbon fibre. A Type 1 steel cylinder is effectively permeation-free — metal is a near-perfect gas barrier — but a 6.8-litre steel cylinder at high pressure weighs several times its composite equivalent. A Type IV cylinder wraps carbon fibre around a polymer liner and wins the weight war decisively, but the polymer is the gas barrier, and polymers are permeable:
- Hydrogen, the smallest molecule, works through thin polymer liners at rates that make long-duration storage impractical — fine for a drone that fills daily, unusable for a tank that must hold pressure for months.
- Helium is worse: roughly 2–3× the permeation rate of hydrogen through most polymers. Helium pressurant systems, leak-test rigs, balloon and airship programmes, and satellite cold-gas systems have historically had one honest answer — a metal liner, with the weight and the fatigue-limited cycle life that come with it.
We’ve published the numbers for years in our permeation calculator and the PET vs HDPE liner analysis — including the honest figure for our own classic PET-lined cylinders. The engineering trade was real: minimum mass or gas-tightness. Pick one.
What changed: the MEYER sealed liner
Our 2026 hydrogen and helium range ships with a new proprietary liner system that closes the permeation path entirely. In qualification testing, cylinders built on the sealed liner show no measurable permeation for hydrogen or helium — losses sit below the detection threshold of helium leak-detection equipment, the most sensitive gas-escape measurement in industrial use. In our permeation model, that places the sealed liner at the Type 1 steel reference rate — which is why the calculator now offers “MEYER® sealed” as a liner option alongside steel, aluminium, HDPE and PET.
What that means in cylinder terms:
| Type 1 (steel) | Generic Type IV (polymer liner) | MEYER sealed-liner cylinder | |
|---|---|---|---|
| H₂ / He permeation | None | High — tens of %/month (H₂), worse for He | No measurable loss |
| 6.8 L / 350 bar cylinder weight | ~10–14 kg class | 2.8 kg | 2.8 kg |
| Cycle life | Good | Excellent (no metal fatigue) | Excellent (no metal fatigue) |
| Long-duration storage | Yes, at 4–5× the mass | No | Yes |
The cycle-life point deserves emphasis. The traditional route to gas-tight composite cylinders — a thin metal liner (Type III, or “Type IV-M”) — buys tightness at the cost of metal fatigue, which caps pressure cycles. The sealed liner is not a metal liner: a MEYER hydrogen or helium cylinder keeps its full composite fatigue behaviour, so gas-tightness no longer costs you cycle life either.
Who this unlocks — helium first
- Helium systems, finally on composite. Pressurant storage, cold-gas propulsion, leak-test rigs, lighter-than-air programmes: applications that have carried steel or aluminium for decades can now spec a 2.8 kg cylinder instead. Every HDRX size is available as a dedicated -HE part number — see the helium range in the catalog.
- Hydrogen that stays put. A fuel-cell UAV that fills before each sortie never noticed permeation. A hydrogen system that must hold pressure across weeks — backup power, remote assets, seasonal operations — absolutely did. The HDRX-068-H2 and the 40 L HDRX-400-H2 now serve both.
- Long-duration R&D setups where a bench must sit pressurised between test campaigns without drift skewing the data.
The honest footnotes
- “No measurable” is a measurement statement, not a metaphysical one: losses are below helium leak-detection thresholds under our qualification test conditions. We publish it that way deliberately — engineers should distrust anyone claiming absolute zero.
- Whole-system tightness still depends on your valve, regulator and seals — a perfect cylinder feeding a leaky fitting still loses gas. Pair it properly: our validated cylinder–regulator development exists for exactly this reason.
- Measured permeation data for a specific SKU is available with the certificate documentation — ask when you order.
Availability
The sealed liner ships in the 2026 hydrogen (-H2) and helium (-HE) models across the range: the hydrogen 6.8 L and 40 L models (CE certified) are open for pre-order with first deliveries from mid-September, the helium range is available to order, and the 120 L and 350 L sizes are in development. Browse by gas: hydrogen · helium — or run your own numbers in the permeation calculator.
HDRX-068-H2 (pre-order — batch 1 ships mid-September) and HDRX-068-HE (order now) — 6.8 L / 350 bar, 2.8 kg, CE certified, no measurable permeation. Hydrogen specs & datasheet → · Helium range →
