Chapter 40 covers natural rubber, synthetic rubber, reclaimed rubber, and unvulcanized rubber products. This chapter is classified by rubber form and processing stage, including unvulcanized rubber compounds (4005), unvulcanized rubber products (4006-4008), and vulcanized rubber products (4010-4017). Heading 4005 specifically refers to primary form products of unvulcanized rubber mixed with compounding agents that have not been vulcanized. Heading 4005 includes unvulcanized rubber compounds, i.e., rubber compounds that have been mixed with compounding agents (such as carbon black, sulfur, accelerators, etc.) but not vulcanized. It covers forms such as plates, sheets, strips, rods, granules, etc., and also includes compounds with small amounts of other ingredients. However, it excludes vulcanized rubber, unmixed raw rubber (4001-4004), and rubber products. First 2 digits 40: Chapter 40, representing rubber and articles thereof. Digits 3-4: Heading 4005, referring to unvulcanized rubber compounds. Digits 5-6: Subheading 4005.99, for other unvulcanized rubber compounds, i.e., all unvulcanized rubber compounds other than 4005.10 (unvulcanized rubber solutions, dispersions) and 4005.20 (unvulcanized rubber mixed with carbon black or silica). The coding hierarchy is: Chapter → Heading → Subheading. This commodity is unvulcanized rubber mixed with compounding agents, but not mixed with carbon black or silica, and is not a solution or dispersion, so it is classified under 4005.99. If mixed with carbon black or silica, it should be classified under 4005.20; if it is a solution or dispersion, under 4005.10; if already vulcanized, under 4010, etc.

Product Name: The standard name of the declared commodity, such as "unvulcanized rubber compound" Composition and Content: List each ingredient and percentage, such as type of raw rubber, names and content of compounding agents Appearance: Describe the form, such as plates, sheets, strips, rods, granules, etc. Whether Vulcanized: Clearly state whether vulcanization treatment has been applied Brand or Model: Declare if there is a brand or model Packaging Specifications: Such as weight per package, length per roll, etc. Purpose: Briefly describe the processing use, such as for manufacturing tires Product Name: Unvulcanized rubber compound; Composition and Content: Natural rubber 60%, carbon black 30%, sulfur 2%, accelerator 1%, others 7%; Appearance: Black sheet; Whether Vulcanized: Unvulcanized; Brand: None; Model: None; Packaging Specifications: 20kg per sheet; Purpose: For manufacturing tire treads. Mistakenly classifying unvulcanized rubber compounds as vulcanized rubber products (4010, etc.) Ignoring whether the composition contains carbon black or silica, leading to subheading errors Failing to declare whether vulcanized, causing classification disputes

Core basis for classification: 1) The commodity is in unvulcanized state; 2) It is a compound of rubber and compounding agents; 3) It is not a solution or dispersion; 4) It is not mixed with carbon black or silica. Need to combine Tariff notes and customs classification decisions, focusing on reviewing composition, appearance, and processing technology. 4005.10 Unvulcanized rubber solutions, dispersions: 4005.10 is in solution or dispersion form, while 4005.99 is a solid compound (plates, sheets, etc.). 4005.20 Unvulcanized rubber mixed with carbon black or silica: 4005.20 specifically refers to rubber compounds mixed with carbon black or silica; if carbon black is contained, classify here; otherwise, under 4005.99. 4006 Other unvulcanized rubber products: 4006 refers to products of unvulcanized rubber (such as rods, tubes, etc.), while 4005 refers to primary form compounds. 4001 Natural rubber: 4001 is unmixed natural rubber, 4005 is rubber compound already mixed with compounding agents. 4010 Vulcanized rubber plates, sheets, strips: 4010 is vulcanized rubber products, 4005 is unvulcanized compounds. Is it confirmed to be unvulcanized? Does it contain carbon black or silica? Is it a solution or dispersion? Has it been mixed with compounding agents? Is it in primary form?

How to determine whether a rubber compound has been vulcanized? It can be determined by testing the degree of crosslinking or inquiring about the production process. If it has undergone heating or sulfur addition treatment, it is usually vulcanized; if unvulcanized, it remains plastic and can dissolve in specific solvents. What is the key difference between 4005.99 and 4005.20? The key difference is whether it is mixed with carbon black or silica. If mixed with carbon black or silica, classify under 4005.20; otherwise, under 4005.99. If unvulcanized rubber compound is cut into sheets, does it affect classification? No. 4005 includes forms such as plates, sheets, strips, etc.; as long as it is unvulcanized and is a compound, it is still classified under 4005. How to inquire about the import tariff rate for 4005.99? You can log on to the General Administration of Customs website or use a tariff inquiry tool, enter code 4005.99, and check the MFN rate, general rate, etc. Note that rates may be adjusted. How to fill in the composition and content when declaring? It is necessary to list the type and percentage of raw rubber, names and percentages of compounding agents, such as natural rubber 60%, carbon black 30%, etc. It is not acceptable to only write "rubber". If the compound contains a small amount of solvent, is it classified under 4005.10? If it is a solution or dispersion, classify under 4005.10; if it is in solid form, even if it contains a small amount of solvent, it may still be classified under 4005.99. What are the regulatory conditions for 4005.99? Usually there are no special regulatory conditions, but attention should be paid to whether it involves dangerous goods or environmental protection requirements, subject to the latest customs announcements. How to declare unvulcanized rubber compound sold via cross-border e-commerce? It must be declared according to the actual commodity, providing composition, purpose, etc., and attention should be paid to whether it complies with the cross-border e-commerce retail import list; otherwise, it must be declared under general trade.