Is hydrogen a highly hazardous or moderately hazardous medium?

Hydrogen is generally considered a highly dangerous medium because it is flammable and explosive. Although not explicitly mentioned in the GBZ230-2010 and HG20660 standards, extra care should be taken in safety management and operation. .

In certain specific scenarios, such as in high-pressure containers, confined spaces, or when in contact with other flammable and explosive substances, the hazard posed by hydrogen can reach a very high level. At this time, strict safety measures need to be taken to ensure the safety of personnel and the environment. In normal usage scenarios, such as during storage and use at room temperature and pressure, the hazard posed by hydrogen may be relatively low; nevertheless, it is still necessary to take appropriate safety measures to prevent leaks and explosions. The hazards of hydrogen depend on factors such as its specific application scenarios, storage conditions, and the potential risks it may pose. In certain specific scenarios, hydrogen may be considered a highly hazardous medium ； In normal usage scenarios, its hazard level may be relatively low, but it still requires attention.

According to the GB/T42594-2023 standard, hydrogen is non-toxic

It can be considered a hazard caused by poisoning! It is only flammable and explosive, and non-toxic.

Hydrogen is non-toxic; its hazards mainly stem from its flammability, explosiveness, and hydrogen embrittlement properties

Hydrogen – Classification of occupational hazard level: Mild hazard

Hydrogen has not yet been assigned a specific classification in the grading system for the hazards associated with occupational exposure to toxic substances. However, based on its properties and potential hazards, it can be concluded as follows: 1. In terms of flammability, hydrogen is considered to be a highly dangerous substance. 2. Regarding the risk of asphyxiation: At high concentrations, hydrogen can displace oxygen in the air, leading to oxygen deficiency and asphyxiation in humans. Therefore, hydrogen is relatively dangerous, but using simple classifications such as high or medium levels is not very accurate. During actual production, storage, use, and other processes, it is essential to strictly adhere to relevant safety regulations and operating procedures to ensure safety.

GBZ230 Occupational Exposure to Toxic Substances: Substances that workers are exposed to in their professional activities, existing in forms such as raw materials, finished products, semi-finished products, intermediates, reaction by-products, and impurities; these substances can enter the human body through the respiratory tract, skin, or mouth, thereby posing a threat to workers’ health. Hydrogen is a asphyxiating gas and does not meet the definition of an occupational toxicant; therefore, it should not be classified according to GBZ230.

Hydrogen itself is non-toxic, but due to its flammability and explosiveness, it is a highly dangerous gas