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Hydrogen standards
The Ministry of Economy, Trade, and Industry (METI) specifies the method of safety inspection in the Safety Inspection Standards (KHKS 0850 series) issued by KHK (The High Pressure Gas Safety Institute of Japan).
KHK/JPEC S 0850-9 (2018), issued on November 6, 2018, Appendix F stipulates the following:
    •F2. Hydrogen Quality - Hydrogen quality shall satisfy Table 1 in ISO 14687-2:2012 Hydrogen fuel - Product specification - Part 2: Proton exchange membrane (PEM) fuel cell applications for road vehicles, with a maximum water content of 5 ppm, a maximum oxygen content of 5 ppm, and a minimum hydrogen purity of 99.97%
    •F3. Quality Control of Hydrogen - ISO/DIS 19880-8 Gaseous Hydrogen - Fueling stations - Part 8: Fuel quality control or industrial standard HySUT-G0001 (2020) Op
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Hydrogen standards