Oxygen - Experis ultra-high purity gases Technical specification

Significance of the topic

Ultra-high purity oxygen plays a critical role in analytical chemistry and process control, where even trace levels of impurities can compromise accuracy and reproducibility. In applications such as elemental analysis, gas chromatography and pharmaceutical manufacturing, the presence of interfering species like nitrogen, water or hydrocarbons must be minimized to ensure reliable results. Using gases that meet stringent purity criteria supports regulatory compliance and enhances sensitivity in quantitative measurements.

Objectives and overview of the study

This technical specification describes the range of Experis® ultra-high purity oxygen grades offered by Air Products. It outlines the purity levels, methods of analytical verification, packaging options and key performance characteristics. The document is intended to guide users in selecting the appropriate oxygen grade for demanding laboratory and industrial applications, with full traceability and quality assurance under ISO 9001:2008.

Methodology and instrumentation

The product line is characterized by two modes of purity verification: batch analysis, where representative cylinders from a production lot are tested statistically, and individual cylinder analysis, providing a certificate of analysis for each unit. Pharma-grade oxygen complies with European, US and Japanese pharmacopoeia monographs and is accompanied by hard-copy certificates (GMP part II). All testing is conducted within an accredited Quality Management System, and analytical methods quantify impurities such as nitrogen, hydrogen, carbon monoxide, carbon dioxide, water, total hydrocarbons and argon to parts-per-million levels.

Main results and discussion

The Experis® oxygen portfolio includes five grades: Industrial (99.5 %), Premier (99.995 %), Pharma (99.995 %), UltraPure (99.9992 %) and UltraPure Plus (99.9998 %). Impurity specifications vary by grade and include:

• Hydrogen: down to <0.1 ppm in UltraPure Plus
• Nitrogen: down to <0.4 ppm in UltraPure Plus
• CO + CO₂: down to <0.1 ppm
• Water: down to <0.5 ppm
• Total hydrocarbons and argon: <0.1 ppm in the highest grade

These low impurity levels are achieved through rigorous cylinder filling, storage and analytical protocols, ensuring repeatable performance and full traceability via unique lot numbers.

Benefits and practical applications

Experis® UltraPure Plus oxygen, with sub-ppm nitrogen levels, is particularly beneficial for elemental analyzers where sample nitrogen content must be measured without background interference. High-purity oxygen also supports robust calibration of detectors and stable combustion reactions in process laboratories. The availability of multiple cylinder sizes and high-purity regulators and manifolds further simplifies integration into existing gas distribution systems.

Future trends and applications

As analytical instruments advance toward lower detection limits, demand for ultra-high purity gases will increase. Future developments may include on-site real-time impurity monitoring, further reduction of critical contaminants and expanded specialty gas portfolios for emerging techniques such as high-resolution mass spectrometry and advanced sensor technologies. Integration with digital traceability platforms will enhance supply chain transparency and regulatory compliance.

Conclusion

The Experis® range of ultra-high purity oxygen products offers a comprehensive selection of grades, analytical verification methods and packaging formats. By controlling key impurities to sub-ppm levels and ensuring full ISO-accredited quality management, these gases deliver the performance and reliability required in modern analytical and process applications.