Chapter 39 covers plastics and articles thereof, and is an important chapter in the HS classification organized by material. This chapter includes plastics in primary forms, waste and scrap, semi-manufactures, and various finished plastic products, involving polymers such as polyethylene, polystyrene, polyvinyl chloride, etc. The chapter notes strictly define the definition of "plastics", the scope of processing, and the relationship with other chapters, such as composites of plastics and textiles, and the distinction between plastics and rubber. 3921 falls within the scope of semi-manufactures and finished products, specifically plates, sheets, film, foil, and strip, and is a common heading in plastic processing trade and customs declaration. Heading 3921 covers plastic plates, sheets, film, foil, and strip (non-cellular and cellular), but excludes products specifically named in other headings of Chapter 39, such as synthetic leather, floor coverings, etc. This heading is further subdivided according to whether cellular, whether reinforced, laminated, supported, etc. 3921 includes cellular plastic plates and sheets, widely used in packaging, construction, automotive, electronics, and other fields. Subheading 392111 specifically refers to plates, sheets, film, and foil of cellular polystyrene, an important category of cellular plastics, commonly found in insulation materials, cushioning packaging, etc. The first 2 digits "39" represent Chapter 39: Plastics and articles thereof. The 3rd-4th digits "21" represent heading 3921: plastic plates, sheets, film, foil, and strip. The 5th-6th digits "11" represent subheading 392111: plates, sheets, film, and foil of cellular polystyrene. Specifically, under 3921, products are first divided by whether cellular: 392111 is cellular polystyrene, 392112 is cellular polyvinyl chloride, 392113 is cellular polyurethane, 392114 is cellular regenerated cellulose, and 392119 is other cellular plastics. 392111 is further limited to polystyrene (PS) material, in cellular form, in the shape of plates, sheets, film, foil (excluding strip; strip falls under 392190? Actually 3921 includes strip, but 392111 only covers plates, sheets, film, and foil). This code requires clarification of material, cellular state, shape, and use in customs declaration. The goods are plates, sheets, film, and foil of cellular polystyrene. Because the material is polystyrene, the form is cellular plastic plates and sheets, and they are not specifically named in other headings, they are classified under 392111. If they were strips of cellular polystyrene, they would be classified under 392190? But 392111 is limited to plates, sheets, film, and foil. If they were non-cellular polystyrene plates and sheets, they should be classified under 392030 or 392190? Actually non-cellular plates and sheets are classified under 392030 (non-cellular polystyrene plates and sheets). If cellular polystyrene is combined with other materials, it is necessary to determine according to the chapter notes whether it is still classified under 3921. Therefore, the core differences lie in the cellular state, material, and shape.

Product name: The standard name of the declared commodity should include material, cellular state, and shape, such as "cellular polystyrene board". Material: Clearly specify polystyrene (PS), and may indicate whether modified or blended with other polymers. Cellular state: Indicate "cellular" or "foamed" to distinguish from non-cellular plastics. Appearance and shape: Describe as plate, sheet, film, or foil, and indicate whether in rolls and dimensions (length, width, thickness). Use: Explain the main use, such as packaging, insulation, construction, automotive, etc. Brand and model: If there is a brand and model, they must be declared truthfully. Density: The density of cellular plastic (kg/m³), which affects classification and customs valuation. Whether reinforced/laminated/supported: Indicate whether combined with other materials, reinforced, or supported, which affects subheading subdivision. Customs declaration example: Product name: Cellular polystyrene board Material: Polystyrene (PS) Cellular state: Cellular Appearance and shape: Rectangular board, length 1000mm, width 500mm, thickness 20mm, not in rolls Use: Building insulation Brand: XYZ Model: PS-20 Density: 25kg/m³ Whether reinforced/laminated/supported: No HS code: 3921110000 Mistakenly classifying non-cellular polystyrene plates and sheets under 392111, when they should actually be classified under 392030. Mistakenly declaring cellular polystyrene strip as plates or sheets; strip should be classified under 392190. Failure to indicate density or dimensions, causing customs to question the classification. Composite products without explaining the composite status may be classified under other headings. Confusing cellular polystyrene with cellular polyurethane, resulting in incorrect material declaration.

The core criteria for classification are: 1) the material is polystyrene (homopolymer or copolymer); 2) the form is cellular; 3) the shape is plate, sheet, film, or foil (excluding strip); 4) not combined with other materials or only surface-reinforced. According to the Chapter 39 notes and the text of heading 3921, cellular polystyrene plates, sheets, film, and foil are classified under 392111. If non-cellular, they are classified under 392030; if strip, under 392190; if composite products, it is necessary to determine according to the chapter notes whether they are still classified under Chapter 39. 392030 Non-cellular polystyrene plates, sheets, film, and foil: 392030 is non-cellular polystyrene plates and sheets, while 392111 is cellular polystyrene plates and sheets. The key difference is whether cellular. 392112 Cellular polyvinyl chloride plates, sheets, film, and foil: Different material: 392112 is polyvinyl chloride (PVC), while 392111 is polystyrene (PS). 392113 Cellular polyurethane plates, sheets, film, and foil: Different material: 392113 is polyurethane (PU), while 392111 is polystyrene. 392190 Other plastic plates, sheets, film, and foil: 392190 covers other cellular plastic plates and sheets and strip, while 392111 is specifically named cellular polystyrene plates, sheets, film, and foil. 392119 Other cellular plastic plates, sheets, film, and foil: 392119 is other cellular plastics (not polystyrene, polyvinyl chloride, polyurethane, etc.), while 392111 is polystyrene. Is the material polystyrene? Has it been foamed? Is the shape plate, sheet, film, or foil? Is it combined with other materials? Does it belong to strip (should be classified under 392190)?

How can I check the import tax rate for 392111? You can use the official website of the General Administration of Customs, China International Trade Single Window, or third-party query platforms. Enter HS code 3921110000, select the country of origin, trade mode, etc., and the system will display the MFN rate, interim rate, VAT rate, etc. Note that tax rates may change, and the latest published rates shall prevail. What is the difference in classification between cellular polystyrene plates/sheets and cellular polystyrene strip? Cellular polystyrene plates, sheets, film, and foil are classified under 392111, while strip (width exceeding 5mm, thickness exceeding 1mm, in rolls or not) is classified under 392190. Strip usually refers to long strips with a rectangular cross-section, and the difference from plates and sheets lies in shape and dimensional proportions. If cellular polystyrene plates or sheets are surface-covered with aluminum foil, which code should they be classified under? If the aluminum foil only serves for reinforcement or decoration and does not change the essential character, they may still be classified under 392111; if after combining they become other products, such as aluminum-plastic composite panels, they may be classified under 7606 or 7616, etc. Judgment should be based on the chapter notes and General Rules for the Interpretation of the Harmonized System. What regulatory conditions are required for exporting products under 392111? Generally, there are no special regulatory conditions for export, but the requirements of the destination country must be met. If dangerous goods or special uses are involved, MSDS, test reports, etc. may be required. Specific requirements can be checked via customs regulatory condition codes. How to distinguish between expanded polystyrene (EPS) and extruded polystyrene (XPS)? Both are polystyrene foams, but the production processes differ: EPS is expandable polystyrene molded and foamed, while XPS is extruded and foamed. Both are classified under HS code 392111, but when declaring, EPS or XPS may be indicated in the product name for customs identification. Does 392111 for cellular polystyrene plates and sheets include waste and scrap? No. Waste and scrap are classified under 3915. 392111 only refers to plates, sheets, film, and foil other than primary forms, and they are finished or semi-finished products. If they are offcuts, they should be classified as waste and scrap. How does density affect classification at the time of declaration? Density itself does not determine classification, but it may affect customs valuation and the customs' judgment of the product's nature. Cellular plastics usually have low density, and accurate density values must be provided at declaration to avoid classification disputes. If cellular polystyrene plates or sheets are used for food packaging, are there additional requirements? Materials used for food contact must comply with national food safety standards, and exports must comply with destination regulations. At customs declaration, a food contact material declaration or test report may be required, but the HS code remains unchanged.