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Hot Selling High Purity 99.999% 99.9999% 40L 47L 50L Seamless Steel Oxygen Gas Cylinder for Industry. High Purity Oxygen: Oxygen purity up to 99.999% with strict impurity control. Customized Color: Available in green or customized color options. Seamless Steel Construction: Made from high-strength steel like 34CrMo4 with no welds for safety. Multiple Pressure Ratings: Working pressures available at 150bar and 200bar. Wide Capacity Range: Water capacities from 1.5L to 50L to suit various needs. International Certifications: Certified under ISO9809, TPED, CE, and DOT3AA standards. Long Service Life: Steel cylinders can be used indefinitely with periodic inspection. OEM Services: Accepts OEM production with custom branding and accessories.