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Recently, there have been an increasing number of safety accidents involving hazardous chemicals. On June 17, there was an ammonia leak in Ma’anshan; on June 15, an LNG tank truck was hit from behind in Shantou, Guangdong. On June 17, another LNG tank truck was involved in an accident in Zhejiang. On June 18, a 30-ton ethyl acetate tank truck had an accident, and on June 19, a 32.7-ton methanol tank truck was hit from behind. On June 20, an LNG tank truck in Yanghua, Guangdong, caught fire after being hit from behind, resulting in 2 deaths. Today, the editor of Wei Siji will provide you with information on the safety aspects of hazardous chemicals, helping you understand fully the crucial role that these chemicals play in reducing accidents of this type. http://p1.itc.cn/images01/20200701/0cae175ed636404c9a5c234679583bba.jpeg I. Definition of hazardous chemicals Hazardous chemicals refer to highly toxic chemicals and other chemicals that possess properties such as toxicity, corrosivity, explosiveness, flammability, or oxidizing capacity, and that can cause harm to human beings, facilities, and the environment. Chemicals subject to the management of the “Catalogue of Hazardous Chemicals (2015 Edition)”. The \"Catalogue of Hazardous Chemicals (2015 edition)\") lists 2,828 categories of hazardous chemicals, among which 148 are highly toxic hazardous chemicals. II. Major Hazard Sources of Hazardous Chemicals: The standard \"Identification of Major Hazard Sources of Hazardous Chemicals\" (GB 18218-2018) details the hazardous chemicals that constitute major hazard sources along with their critical quantities, the criteria for identifying such sources, the indicators used for identification, the classification of major hazard sources, and the process for identifying them. III. 74 Types of Hazardous Chemicals Under Strict Supervision. Common hazardous chemicals that are subject to strict supervision in production include: chlorine, ammonia, liquefied petroleum gas, hydrogen sulfide, methane, natural gas, crude oil, gasoline (including methanol-based and ethanol-based gasoline), naphtha, benzene (including crude benzene), sulfur dioxide, carbon monoxide, methanol, sodium chlorate, nitrocellulose, etc. IV. Hazardous characteristics of hazardous chemicals 1. Physical hazards: These are classified into 16 categories, including flammable gases, aerosols (also known as sprays), oxidizing gases, compressed gases, flammable liquids, flammable solids, self-reactive substances and mixtures, self-heating substances and mixtures, substances and mixtures that release flammable gases when in contact with water, metal corrosives, oxidizing liquids, oxidizing solids, and organic peroxides. 2. Health hazards: They are classified into ten categories, including acute toxicity, skin corrosion/irritation, severe eye damage/eye irritation, sensitization of the respiratory tract or skin, mutagenicity to germ cells, carcinogenicity, reproductive toxicity, specific target organ toxicity – single exposure, specific target organ toxicity – repeated exposure, and inhalation hazards. 3. Environmental hazards: These are divided into two categories, namely hazards to aquatic environments and hazards to the ozone layer. The editor from Wei Si Ji reminds all professionals in the hazardous chemicals industry to gain a thorough understanding of the safety aspects related to these substances, in order to further prevent accidents from occurring.