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I. Overview of other Category 2 hazardous materials: (1) Category 2 gas hazardous materials are divided into three subcategories: 2.1 Category: Flammable gases; 2.2 Category: Non-flammable, non-toxic gases; 2.3 Category: Toxic gases. (2) Transportation of Category 2 hazardous materials: These gases are usually transported in pressure-resistant containers; during transportation, exposure to heat or collisions can cause an increase in pressure inside the containers； The gas itself can also corrode the container, reducing its pressure resistance and thereby causing explosions, fires, and poisoning. Whether the product itself is hazardous or not, Category 2 gases are considered hazardous materials in international transportation. (3) Examples of common types of hazardous goods: Butane cylinders, UN2037, Class 2.1; Lighters, UN1057, Class 2.1; Chloroethane, UN1037, Class 2.1; Gas separators, UN1950, Class 2.2; Fire extinguishers, UN1044, Class 2.2; Ethylene oxide, UN1040, Classes 2.3+2.1; Sulfur hexafluoride, UN1080, Class 2.2. II. Export procedures for Class 2 gas hazardous goods: (1) Booking a shipment: It is relatively easy to book shipments for Class 2.1 and Class 2.2 hazardous goods, as most shipping companies that handle hazardous goods do not have strict restrictions or prohibitions regarding these categories of goods. However, for Class 2.3 hazardous materials, which are toxic gases, various shipping companies have strict requirements and restrictions regarding them. There are not many shipping companies capable of handling Class 2.3 toxic gases. To determine whether a hazardous materials agent is professional, it is necessary to see if they are familiar with the techniques for selecting ships and arranging bookings for Class 2.3 hazardous materials. Overall, there are many techniques involved in the booking and handling of Class 2 hazardous materials. Since Class 2 hazardous materials account for a small proportion of all hazardous materials, and are mainly found in industries such as refrigerants and specialty gases, there are not many freight forwarders who can handle such materials on a long-term and consistent basis. For exporters of Class 2 hazardous goods, finding a freight forwarder who is truly capable of handling such goods can help avoid many complications in the export process, enabling them to complete international trade logistics efficiently at the lowest possible cost, thus achieving twice the result with half the effort. (2) Forms of hazard declaration: 1. Hazardous goods packaging certificate; 2. Quantitative declaration; 3. Cylinder certificate; 4. Carton certificate. There are many different forms of hazard declaration, and for Category 2 hazardous goods, the above four forms are the more common ones. Many exporters are only aware of the hazardous goods packaging certificate as a form of declaration, but this is merely the most basic one. Due to the special requirements regarding packaging for Category 2 hazardous goods, it can be difficult to obtain a hazardous goods packaging certificate; therefore, exporters might consider using another form of hazard declaration, as long as it meets the requirements of the International Maritime Dangerous Goods Code. This helps to **reduce the difficulties exporters face in handling documentation related to transportation. (3) Customs declaration: Trade format: For Class 2 gas cylinders, which are hazardous goods, regular trade and temporary import/export are currently the more common methods. Temporary import and export are further divided into first-in-last-out and first-out-last-in; upon further subdivision, they are also categorized as full-in-empty-out, empty-in-full-out, full-out-empty-in, and empty-out-full-in. Procedures such as registration, verification, and cancellation, as well as the amount allowed for device replacement, vary depending on the operation mode, with each requiring different documents. Here’s a key point: it’s necessary to have clear information on bottle gas declarations, customs declaration data, bill of lading details, packing lists, and data related to the goods’ arrival at the port; otherwise, the data on the bill of lading will double, requiring corrections to be made. III. Import: 1. First, determine the type of trade: whether it is import under normal trade terms or temporary import and export. Temporary import and export for regular cyclic shipments are more common. Temporary import and export are further divided into first-in-last-out and first-out-last-in; upon further subdivision, they are also categorized as full-in-empty-out, empty-in-full-out, full-out-empty-in, and empty-out-full-in. Procedures such as registration, verification, and cancellation, as well as the amount allowed for device replacement, vary depending on the operation mode, with each requiring different documents. 2. In the case of temporary import and export, when empty cans or bottles are imported after being cleaned, they are treated as ordinary goods; it is essential to remind the sender not to include any hazard labels on the empty bottles when sending them back. 3. For temporarily importing and exporting empty cylinders, it is necessary to determine in advance whether to obtain a cylinder certificate corresponding to the specific cylinder number after customs clearance. 4. If you are just starting out with temporary import and export, the first export customs declaration is crucial; otherwise, the deposit for the bottles used in that first shipment cannot be refunded. 5. If the imported steel cylinders fail the inspection by the commodity inspection authority, a cylinder certificate is also required. For cylinders of foreign origin or those for which no cylinder certificate can be provided, the cylinders must be sent to a warehouse designated by the Special Inspection Institute on Lubin Road for testing, so as to obtain a temporary import/export inspection certificate for the cylinders. Obtaining such an inspection certificate requires a high level of expertise and skill from the freight forwarder handling dangerous goods, as there are many details to take into account. For example, inspections are conducted on Wednesdays at Lubin Road and certificates are issued on Mondays; if the deadline is missed, one more week has to be waited. The vehicle used to transport the cylinders for inspection must be a vehicle designed for transporting dangerous goods, and the validity period of the cylinder certificate is three months, among other requirements. What has been said above is rather general, and many essential points cannot be conveyed. As a leading provider of international logistics services for hazardous goods in China, Shunxin Logistics specializes in the import and export of hazardous goods in the form of cylinders classified as categories 2.1, 2.2, and 2.3, as well as TANK-type hazardous goods. With over a decade of experience in dealing with category 2 gas hazardous goods, the company has built up a substantial network of clients and extensive operational expertise. Importers and exporters of various types of Class 2 hazardous goods can contact us at any time to discuss and seek advice on the problems they encounter in actual export operations.