This article explains the materials science behind H2ForLife’s packaging choices — why aluminum cans are used, how they preserve dissolved hydrogen concentration, and what the alternatives cannot do. It connects to KA-006 — Hydrogen Concentration and KA-005 — Independent Testing.
🔵 30-Second Summary
Dissolved molecular hydrogen (H₂) is a gas dissolved in water. Like all dissolved gases, it follows Henry’s Law — it will escape from solution whenever the partial pressure of H₂ above the liquid is lower than the equilibrium pressure. In practical terms: H₂ escapes from water whenever it is exposed to air, and it permeates through most plastics.
Aluminum is impermeable to H₂. A properly sealed aluminum can maintains dissolved H₂ concentration throughout the product’s shelf life because H₂ cannot escape through the can walls or the sealed lid. Standard plastic bottles cannot do this — H₂ permeates through the plastic and the concentration drops continuously from the moment of filling.
Packaging format is not a marketing choice — it is a materials science requirement for maintaining dissolved H₂ concentration from production to consumption.
🟨 Key Takeaways
Dissolved H₂ follows Henry’s Law — it escapes from water whenever the partial pressure of H₂ above the liquid is lower than the equilibrium pressure, which is always the case when exposed to air
H₂ permeates through most plastics — standard plastic bottles cannot maintain dissolved H₂ concentration over a product’s shelf life
Aluminum is impermeable to H₂ — a properly sealed aluminum can maintains dissolved H₂ concentration throughout the product’s shelf life
Packaging format is a materials science requirement, not a marketing choice — the container determines whether the dissolved H₂ concentration on the label is what the consumer actually receives
H2ForLife uses aluminum cans specifically because they are the only standard consumer packaging format that reliably preserves dissolved H₂ concentration from production to consumption
Short answer: Dissolved H₂ escapes from water through any permeable container and whenever exposed to air. Aluminum is impermeable to H₂ and maintains dissolved concentration throughout shelf life. Standard plastic bottles are permeable to H₂ and cannot maintain concentration. H2ForLife uses aluminum cans because they are the only standard consumer packaging format that reliably preserves dissolved H₂ from production to consumption.
The Core Problem — Why Packaging Matters for Dissolved H₂
🔹 Plain English First
Dissolved hydrogen gas behaves like carbonation in a soda — it wants to escape. Open a soda and leave it on the counter, and it goes flat. The CO₂ that was dissolved under pressure escapes into the air. Dissolved H₂ behaves the same way, but with one additional challenge: H₂ molecules are so small that they can permeate through the walls of most plastic containers, even when the container is sealed. A plastic bottle of hydrogen-rich water loses dissolved H₂ through the bottle walls continuously, from the moment it is filled.
🔬 The Science
The behavior of dissolved H₂ is governed by Henry’s Law: the concentration of a dissolved gas in a liquid is proportional to the partial pressure of that gas above the liquid. Since atmospheric H₂ is essentially zero, any dissolved H₂ in water is thermodynamically driven to escape until the dissolved concentration reaches equilibrium with the atmospheric partial pressure — effectively zero. H₂ permeability through polymer materials is determined by the diffusion coefficient and solubility of H₂ in the polymer. Common packaging plastics — PET, HDPE, LDPE, and polypropylene — all have measurable H₂ permeability.
🍃 Why It Matters
A dissolved H₂ concentration claim on a plastic bottle label reflects the concentration at the time of filling — not the concentration at the time of consumption.
Why Aluminum Works
🔹 Plain English First
Aluminum is a metal. Gases cannot permeate through metals the way they permeate through plastics. A properly sealed aluminum can creates a hermetic barrier — nothing gets in or out through the can walls. The dissolved H₂ that was in the can when it was sealed is still there when the consumer opens it.
🔬 The Science
Aluminum has essentially zero gas permeability — it is a hermetic barrier to all gases including H₂. The can seam and lid are sealed using a double-seam process that creates a mechanically interlocked, hermetic closure. The interior of aluminum beverage cans is lined with a thin polymer coating to prevent direct contact between the beverage and the aluminum. This liner is thin enough that H₂ permeation through it is negligible over the product’s shelf life.
🍃 Why It Matters
The aluminum can is the only standard consumer beverage packaging format that provides a hermetic barrier to H₂. Glass is also impermeable to H₂, but glass bottles with standard closures are not hermetically sealed. Aluminum cans with double-seam lids are hermetically sealed.
Packaging Comparison
Packaging Format
H₂ Permeability
Hermetic Seal
Dissolved H₂ Retention
Aluminum can (double-seam)
None
Yes
Stable throughout shelf life
Glass bottle (standard closure)
None through glass
No — closure not hermetic
Loss through closure over time
PET plastic bottle
High
No
Continuous loss from filling
HDPE plastic bottle
High
No
Continuous loss from filling
Aluminum pouch (sealed)
None
Yes (heat-sealed)
Stable if properly sealed
Frequently Asked Questions
Why should I drink H2ForLife promptly after opening?
Once the can is opened, the hermetic seal is broken and dissolved H₂ begins to escape into the air. For maximum dissolved H₂ delivery, consume the product promptly after opening — ideally within a few minutes.
Does refrigeration affect dissolved H₂ concentration?
H₂ solubility in water increases at lower temperatures, so refrigeration slightly increases the equilibrium dissolved H₂ concentration. H2ForLife recommends storing cans in a cool location, though refrigeration is not required for H₂ retention in a sealed aluminum can.
Can I transfer H2ForLife to another container?
Transferring to a non-hermetic container will result in rapid dissolved H₂ loss. Standard glasses, cups, or open containers will result in significant H₂ loss within minutes.
Evidence Snapshot — Packaging Science
H₂ permeability through plastics (materials science)✔ Strong — established polymer science
Aluminum impermeability to H₂✔ Strong — established materials science
Dissolved H₂ retention in sealed aluminum cans✔ Strong — verified by independent testing
Why H2ForLife Uses Aluminum Cans
H2ForLife uses aluminum cans because they are the only standard consumer beverage packaging format that provides a hermetic barrier to H₂ and maintains dissolved H₂ concentration from production to consumption. This is not a marketing choice — it is a materials science requirement.
H2ForLife is committed to accurately representing the current state of scientific research. As new evidence emerges, we periodically review and update our educational content to reflect the evolving scientific literature.
DD
Author
Danny Day
Founder, H2ForLife
Reviewed for scientific accuracy by the H2ForLife Research Team.
💙 Continue Learning
Continue exploring the science behind molecular hydrogen with these related Knowledge Articles:
Hydrogen Concentration — What dissolved H₂ concentration numbers mean and how to evaluate product claims.
Independent Testing — How H2ForLife verifies dissolved hydrogen concentration through independent laboratory testing.
Understanding how packaging preserves dissolved H₂ completes the product science picture. The final Knowledge Article explores the research on molecular hydrogen and healthy aging.
This article is based on established materials science, polymer science, and physical chemistry references relevant to dissolved gas behavior and packaging permeability.
Physical Chemistry — Henry’s Law and Dissolved Gas Behavior
Sander, Rolf.
Compilation of Henry’s Law Constants for Water as Solvent
🔵 Reference — Henry’s Law constants; H₂ solubility data
Polymer Science — Gas Permeability
Crank, John, and G.S. Park (eds.).
Diffusion in Polymers
Academic Press (1968)
ISBN: 978-0121974503
🔵 Foundational Reference — gas diffusion and permeability in polymer materials
Version History
v1.0June 2026 — Initial publication
Educational Disclaimer: This Knowledge Article is provided for educational purposes only and summarizes findings from published scientific literature. It is not intended to diagnose, treat, cure, or prevent any disease, nor should it be considered medical advice. Readers should consult qualified healthcare professionals regarding individual health questions.
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