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Purity Specifications of PSA Medical Oxygen Generators Under WHO International Pharmacopoeia
The World Health Organization (WHO) International Pharmacopoeia clearly classifies medicinal oxygen into two standard grades according to production technology, which sets the global baseline for all qualified medical oxygen generator systems:
Oxygen 93% (PSA molecular sieve oxygen)
99.5% High-Purity Medicinal Oxygen
Unlike industrial oxygen, both grades must meet strict impurity limits for clinical use, eliminating toxic contaminants that threaten respiratory patients.
WHO defines Oxygen 93% as oxygen produced on-site via Pressure Swing Adsorption (PSA) molecular sieve medical oxygen generator, with a fixed purity tolerance of 90.0% ~ 96.0% (nominal 93%±3%).
Residual gas mainly consists of nitrogen and argon, which are inert and harmless to human respiration.
This standard is universally recognized by USP, European Pharmacopoeia (Ph.Eur. Monograph 2455), and all national health authorities worldwide.
All our medical oxygen generator units strictly comply with WHO’s maximum contaminant limits:
Carbon dioxide (CO₂): ≤300 ppm
Carbon monoxide (CO): ≤5 ppm
Total NO + NO₂: ≤2 ppm
Sulfur dioxide (SO₂): ≤1 ppm
Oil content: ≤0.1 mg/m³
Water vapor: ≤67 ppm
Strict control of viable and non-viable particulate pollutants
Per WHO pharmacopoeia rules, oxygen reaching ≥99.5% purity is classified as premium medicinal oxygen, originally produced by cryogenic air separation for liquid oxygen cylinders.
To achieve this purity with on-site medical oxygen generator equipment, a PSA host must be matched with a post-stage purification tower to remove nitrogen and argon impurities.
This high-purity oxygen is required for high-risk clinical scenarios including operating rooms, ICUs, anesthesia equipment, and hyperbaric oxygen chambers.
Beyond WHO International Pharmacopoeia, our 93% medical oxygen generator conforms to cross-border medical device standards:
USP Oxygen 93 Percent (North America, Latin America, Middle East markets)
Ph.Eur. 2455 Oxygen 93 (EU, UK, Australia)
ISO 80601-2-69:2026 (special safety standard for medical oxygen concentrators)
ISO 13485 medical device quality management system
ISO 18562 medical breathing gas pollutant control
WHO strongly recommends 93% PSA medical oxygen generator for primary medical facilities due to low operation cost and stable performance:
Community clinics, general ward oxygen therapy
Home long-term oxygen care for COPD, postoperative rehabilitation patients
Central oxygen supply stations for medium and small hospitals
Field medical stations, emergency oxygen support
Compared with liquid oxygen cylinders, on-site medical oxygen generator avoids high logistics costs, transportation risks and supply shortages.
Medical oxygen generator belongs to Class IIa medical devices under MDR 2017/745. CE MDR certification is mandatory, accepting WHO 93% oxygen specifications and ISO 80601-2-69 test reports. UK market requires separate UKCA marking.
FDA 510(k) listing is compulsory for medical oxygen generator, with USP Oxygen 93 as the legal purity standard. Pressure vessels on oxygen systems need ASME U-Stamp certification.
Brazil ANVISA, Mexico COFEPRIS: Recognize WHO/USP oxygen purity standards, plus INMETRO pressure vessel approval
Malaysia DOSH, Thailand TFDA, Philippines FDA: Accept CE MDR and ISO13485 certification
Saudi SFDA, UAE MOHAP: Prioritize WHO-compliant medical oxygen generator for hospital procurement
We supply two complete medical oxygen generator models fully aligned with WHO specifications to cover all clinical oxygen demands:
1. 93% Purity PSA Medical Oxygen Generator
Single-stage molecular sieve PSA design, stable output of 90–96% oxygen, low energy consumption, suitable for routine ward and home oxygen therapy. Fully meets WHO Oxygen 93% standards and all mainstream international medical device certifications.
2. 99.5% High-Purity Medical Oxygen Generator with Purification Tower
Integrated PSA host + advanced post-purification system, output ≥99.5% medical oxygen matching WHO liquid oxygen grade. Designed for surgical rooms, ICU, anesthesia and hyperbaric oxygen treatment with strict purity requirements.
Q1: Is 93% oxygen from PSA medical oxygen generator legally medical-grade?
A1: Yes. WHO International Pharmacopoeia, USP and European Pharmacopoeia all formally recognize PSA-produced 93% oxygen as official medicinal oxygen, approved for direct patient inhalation worldwide. Industrial oxygen without standard impurity control cannot replace this product.
Q2: Can one medical oxygen generator produce both 93% and 99.5% oxygen?
A2: No. Single-stage PSA molecular sieve units only reach 90–96% oxygen. Stable 99.5% purity requires an additional purification tower to separate argon and nitrogen impurities, which is an independent technical configuration.
Q3: What core standards should buyers verify before importing medical oxygen generator?
A3: Confirm three key documents: WHO-compliant oxygen purity test report, ISO 13485 factory certificate, and regional market certification (CE MDR / FDA 510(k) / TGA / ANVISA).
WHO International Pharmacopoeia establishes unified global purity benchmarks for medical oxygen generator products, separating 93% PSA oxygen for general clinical use and 99.5% high-purity oxygen for critical medical departments. As a professional medical oxygen generator manufacturer, our two product lines fully satisfy WHO specifications and global market access rules, helping medical institutions cut oxygen supply costs while maintaining full regulatory compliance.
