Chapter 39 covers plastics and articles thereof, including plastics in primary forms, waste and scrap, semi-manufactures and finished articles. The headings of this chapter are divided according to the chemical composition of plastics, such as polymers, copolymers, etc. Heading 3920 belongs to plates, sheets, film, foil and strip of non-cellular plastics, and is an important category of plastic semi-manufactures. Goods of this chapter are widely used in packaging, construction, electronics, medical and other fields, and classification requires attention to the type of plastic, its form and the degree of processing. Heading 3920 covers plates, sheets, film, foil and strip of non-cellular plastics, not reinforced, laminated or combined with other materials, nor supported with other materials. It includes plates, sheets, film and foil of various plastics such as polyethylene, polypropylene, polystyrene, polyvinyl chloride, polymethyl methacrylate, etc. However, if surface-worked, cut into specific shapes or combined with other materials, they may be classified under other headings. The first 2 digits 39 represent Chapter 39, plastics and articles thereof, the plastics category in the entire tariff schedule. Digits 3-4, 20, represent heading 3920, specifically plates, sheets, film, foil and strip of non-cellular plastics, not reinforced, laminated, supported or similarly combined with other materials. Digits 5-6, 51, represent subheading 3920.51, specifically plates, sheets, film and foil of polymethyl methacrylate (PMMA). Therefore, 392051 in full means: plates, sheets, film and foil of non-cellular plastics made of PMMA. The goods are plates, sheets, film and foil made of polymethyl methacrylate (PMMA), not combined with other materials, not reinforced and not laminated, meeting the description of heading 3920. PMMA is an acrylic polymer and should be classified under subheading 3920.51. If it were cellular plastic, it would be classified under 3921; if combined with other materials, it might be classified under other subheadings of 3920 or 3919, etc.

Product name: The specific name of the declared goods, such as "polymethyl methacrylate sheet", "PMMA film", etc., which must be consistent with the actual goods. Material: Clearly state polymethyl methacrylate (PMMA); it cannot be written only as "plastic" or "acrylic". Appearance: Describe the shape (plate, sheet, film, foil), color, transparency, etc., such as "transparent rectangular sheet". Specifications and dimensions: Declare length, width, thickness, etc., such as "1000mm×2000mm×3mm". Use: Explain the main use, such as "used for advertising light boxes, display panels", etc. Processing status: Declare whether it has been reinforced, laminated, supported, etc., such as "not reinforced, not laminated". Brand: Declare the brand or manufacturer name; if no brand, fill in "none". Model: Declare the product model or item number for easy identification. Customs declaration example: Product name: Polymethyl methacrylate sheet Material: Polymethyl methacrylate (PMMA) Appearance: Transparent rectangular sheet Specifications and dimensions: 1000mm×2000mm×3mm Use: Used for advertising light box panels Processing status: Not reinforced, not laminated, not combined with other materials Brand: None Model: PMMA-3T HS code: 39205100 Misdeclaring PMMA sheet as "acrylic sheet" without specifying the material, leading to classification errors. Ignoring the processing status; if laminated or reinforced, it should be classified under other subheadings. Incomplete declaration of specifications and dimensions, affecting customs judgment of the goods' attributes.

Core basis for classification: 1. The material must be polymethyl methacrylate (PMMA), an acrylic polymer; 2. The form must be non-cellular plates, sheets, film or foil; 3. Not reinforced, laminated, supported or combined with other materials. Only when all the above conditions are met can it be classified under 3920.51. If it is cellular plastic, it is classified under 3921; if combined with other materials, it may be classified under other subheadings of 3920 or 3919, etc. 39205100 Plates, sheets, film and foil of polymethyl methacrylate: This code, specifically for non-cellular plates, sheets, film and foil of PMMA material. 39205900 Plates, sheets, film and foil of other acrylic polymers: Material is other acrylic polymers, not PMMA, such as polyethyl methacrylate, etc. 39219090 Plates, sheets, film and foil of other plastics: Material is other plastics, or has been reinforced, laminated, etc. 39201000 Plates, sheets, film and foil of polyethylene: Material is polyethylene, not PMMA. 39206100 Plates, sheets, film and foil of polycarbonate: Material is polycarbonate, not PMMA. Is the material polymethyl methacrylate (PMMA)? Is it non-cellular plastic? Is it not reinforced, laminated or combined? Is the form plates, sheets, film or foil? Has it not been cut into other shapes or further processed?

How to determine whether a PMMA sheet is classified under 392051? First confirm that the material is polymethyl methacrylate (PMMA), then that the form is non-cellular plates, sheets, film or foil, and that it has not been reinforced, laminated or combined with other materials. If these conditions are met, it can be classified under 392051. If it is cellular plastic or a composite sheet, it is classified under other codes. Are PMMA sheet and acrylic sheet the same thing? Acrylic sheet usually refers to PMMA sheet, but "acrylic" is a common name. When declaring, the specific material "polymethyl methacrylate" must be declared; it cannot be written only as "acrylic", otherwise customs may question it due to unclear classification. If a PMMA sheet has been coated, can it still be classified under 392051? If the coating is only surface treatment, does not change the basic characteristics, and is not combined with other materials, it may still be classified under 392051. However, if the coating forms a laminated structure or is combined with other materials, it may be classified under other subheadings of 3920 or 3919. It is recommended to provide detailed processing technology. Is there a difference in classification between PMMA film and PMMA sheet? There is no difference. 392051 covers plates, sheets, film and foil. As long as the material is PMMA and meets the conditions of being non-cellular and not combined, it is classified under this code. However, note the thickness distinction: film is usually thinner and sheet is thicker, but the HS code does not subdivide by thickness. If PMMA sheet is used for medical purposes, is it classified under other codes? If the PMMA sheet is specially for medical use and has undergone special processing or sterilization, it may be classified under medical device codes such as 9018. But if it is only raw material and has not been made into a medical device, it is still classified under 392051. Judgment should be based on actual use and degree of processing. How to inquire about the import tax rate for 392051? You can log on to the official website of the General Administration of Customs of China or use the "Customs Tariff" inquiry system, enter HS code 39205100, and check the MFN rate, general rate, VAT rate, etc. Tax rates may be adjusted with policy, and the latest published rates should prevail. What documents are required when declaring 392051? Usually, contracts, invoices, packing lists, bills of lading, material certificates (such as PMMA test reports), processing technology descriptions, etc. are required. If a brand is involved, a brand authorization letter is required. Specific requirements are subject to customs. If a PMMA sheet is cut into a specific shape, is it still classified under 392051? If it is only cut into rectangular or other simple shapes without further processing, it is still classified under 392051. But if it is cut into specific part shapes or further processed (such as drilling, polishing), it may be classified under other codes, such as 3926. Judgment should be based on the depth of processing.