GB/T 3634.2-2025 in English

This standard outlines the specifications for hydrogen in terms of purity levels, including pure hydrogen, high-purity hydrogen, and ultra-pure hydrogen. It provides detailed criteria for the composition, testing methods, and permissible impurities associated with each grade of hydrogen. The document also includes guidelines for sampling, packaging, storage, and transportation to ensure consistency and quality across different applications. Additionally, it defines the terminology and classification methods used in the hydrogen industry. The standard aims to establish a uniform reference for manufacturers, users, and regulatory bodies to follow in order to maintain product quality and safety standards.