Hydrogen - Experis ultra-high purity gases Technical specification

Importance of the topic

Ultra-high purity hydrogen plays a crucial role in analytical chemistry and process control by minimizing contamination and ensuring reliable results. Its exceptionally low levels of critical impurities support sensitive detection methods and extend the lifetime of chromatographic columns.

Objectives and overview of the study

This technical specification describes the Experis range of ultra-high purity hydrogen grades offered by Air Products. It outlines impurity limits, verification methods, packaging options and the benefits of proprietary BIP® technology for analytical and industrial applications.

Methodology and instrumentation

Purity verification is performed by two approaches:

• Batch analysis: Statistical testing of cylinders from the same production batch to confirm conformity.
• Individual cylinder analysis: Each cylinder is analysed separately for guaranteed specification compliance.

Recommended control equipment includes high-purity brass pressure regulators (single- and two-stage) and manifolds (single-wing to automatic changeover) to maintain gas integrity.

Main results and discussion

Four hydrogen grades are specified:

• Technical (99.99 % purity)
• Premier Plus (99.9992 %)
• BIP® (99.9999 %)
• BIP® Plus (99.99996 %)

Key impurity limits for the highest grades include oxygen and water below 0.1 ppm, nitrogen below 0.2 ppm, CO and CO₂ below 0.05 ppm, and total hydrocarbons below 0.01 ppm. Molecular weight and physical properties (boiling point –252.8 °C, gas density 0.084 g/L at 20 °C) are reported. Cylinder sizes range from 2 m³ up to 213 m³ capacity, with pressures of 200–300 bar.

Benefits and practical applications of the method

• Elimination of external purifiers reduces downtime, maintenance costs and waste disposal.
• Consistent purity ensures reproducible results and avoids ‘rogue’ cylinders.
• Lower baseline noise and extended column life in gas chromatography, lowering operational expenses.
• Ultra-low hydrocarbons make BIP grades ideal as carrier or fuel gas in flame ionization detectors.

Future trends and possibilities of use

Advances may include:

• Integration of real-time purity monitoring within cylinder valves.
• Development of smaller, high-pressure packs for field deployments.
• Expansion of inline purification technologies to broader gas portfolios.
• Enhanced sustainability through cylinder return programs and green production methods.

Conclusion

The Experis ultra-high purity hydrogen range delivers verified impurity specifications, robust packaging options and innovative BIP® technology. These features collectively enhance analytical performance, reduce operating costs and support demanding applications in research, QA/QC and industrial process control.