Key takeaways
- PEM and SPE describe the same membrane technology.
- Both produce H₂ at ≥99.991% purity when engineered correctly.
- Membrane quality and stack assembly matter more than the acronym.
Same chemistry, different label
Most consumer machines list PEM. Industrial documentation often uses SPE. The active layer is the same perfluorosulfonic-acid polymer (commonly Nafion or equivalent).
Frequently asked questions
Neither. Membrane brand, stack pressure and water purity determine real output.
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Hydrogen dissolution
Continue →Purity, tablets & bathing
- Hydrogen Bathing vs Hydrogen Tablets — Saturation versus dilution, compared in full.
- Hydrogen Water Purity — 99.991% certified purity from SPE/PEM electrolysis.
- Hydrogen Tablets: What You Should Know — What dissolving reactive material can leave behind.
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