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Level 3 · Advanced· 4 min read·Updated 2026-06-27

Hydrogen purity

Reputable PEM machines deliver hydrogen at ≥99.99% purity. The other 0.01% is mostly water vapour, with trace oxygen.

Key takeaways

  • PEM machines deliver ≥99.99% H₂.
  • Residual fraction is water vapour, not contaminant.
  • Purity is measured at the outlet, not inside the stack.

What "high purity" actually means

Purity is reported as the H₂ fraction in the gas stream leaving the user outlet. PEM separation keeps oxygen below 10 ppm.

Frequently asked questions

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