Chapter 39 covers plastics and articles thereof, including polymers in primary forms, synthetic resins, cellulose and its chemical derivatives, etc. This chapter classifies products based on the chemical structure, source, and processing stage of polymers. Cellulose nitrate, as a type of cellulose ester, falls within the scope of this chapter. Heading 3912 covers cellulose and its chemical derivatives in primary forms, including cellulose nitrate, cellulose acetate, other cellulose esters and ethers, etc. Primary forms refer to unprocessed forms such as liquid, paste, block, powder, granules, etc. The first 2 digits 39 represent Chapter 39 plastics and articles thereof; digits 3-4, 12, represent heading 3912, i.e., cellulose and its chemical derivatives in primary forms; digits 5-6, 20, represent subheading 3912.20, specifically cellulose nitrate (including collodion and celluloid, etc.). Cellulose nitrate is the product of the esterification reaction of cellulose with nitric acid, and has different uses depending on the nitrogen content. The goods are cellulose nitrate in primary forms, belonging to cellulose chemical derivatives, and conform to the description of heading 3912. The difference from adjacent codes 3911 (petroleum resins, etc.) and 3913 (other natural polymers) is that 3912 specifically targets cellulose derivatives, and cellulose nitrate is an explicitly named subheading.

Product Name: The specific name of the declared goods, such as cellulose nitrate, nitrocellulose, etc., which must correspond to the HS code. Appearance: Describe the specific form of the primary shape, such as powder, granules, blocks, solution, etc. Composition and Content: Indicate the cellulose nitrate content and whether it contains additives such as plasticizers, stabilizers, etc. Nitrogen Content: A key indicator of cellulose nitrate, usually expressed as a percentage of nitrogen content, affecting its use and classification. Source: Explain the source of cellulose, such as wood pulp, cotton pulp, etc., and the esterification process. Use: Declare the main use, such as coatings, inks, explosives, celluloid products, etc. Brand: If there is a brand, declare the brand name; if no brand, indicate 'none'. Model: Declare the product model or specifications, such as viscosity, nitrogen content grade, etc. Product Name: Cellulose Nitrate; Appearance: White powder; Composition and Content: Cellulose Nitrate ≥98%, Moisture ≤2%; Nitrogen Content: 11.5%; Source: Wood pulp; Use: For manufacturing coatings; Brand: None; Model: NC-11.5. Nitrogen content not declared or inaccurately declared, affecting dangerous goods determination and classification. Appearance description too simple, not reflecting primary form, may be misclassified as articles. Use declaration not specific, such as only writing 'industrial use', unable to assist classification.

The core basis for classification is whether the goods are cellulose nitrate in primary forms. It is necessary to confirm that its chemical composition is cellulose nitrate ester, and that it is not mixed with other substances or contains only permitted additives. Nitrogen content is the key to distinguishing different subheadings, but 3912.20 does not subdivide nitrogen content; all cellulose nitrate is classified under this subheading. 3911 Petroleum resins, etc.: 3911 covers petroleum resins, coumarone-indene resins, etc., not cellulose derivatives, with different sources and chemical structures. 3913 Other natural polymers: 3913 covers natural polymers not elsewhere specified, such as chitosan, while cellulose nitrate is a chemically modified natural polymer, already named under 3912. 3914 Ion exchangers: 3914 is based on ion-exchange resins, cellulose nitrate has no ion-exchange function, with different uses and compositions. 3601 Propellant powders: 3601 covers gunpowder and propellant powders. If cellulose nitrate is made into gunpowder, it is classified under 3601, but in primary forms it remains under 3912. Is it in primary forms (powder, granules, blocks, etc.)? Is the chemical composition cellulose nitrate? Is the nitrogen content clearly stated in the declaration? Is it used for non-explosive purposes such as coatings, inks, etc.? Is it mixed with other substances? If mixed, check whether it still falls under 3912.

Are cellulose nitrate and nitrocellulose the same thing? Yes, nitrocellulose is a common name for cellulose nitrate, but usually refers to varieties with higher nitrogen content. In the HS code, both are classified under 3912.20, but different nitrogen contents may affect dangerous goods classification and transport requirements. How to query the HS code for cellulose nitrate? You can use the customs tariff or online query tools, enter the keyword 'cellulose nitrate' or 'nitrocellulose', and the system will display 3912.20. You can also search step by step according to the chapter structure: Chapter 39 → 3912 → 3912.20. Why is nitrogen content important when declaring? Nitrogen content determines the hazard class and use of cellulose nitrate. A nitrogen content higher than 12.6% is usually considered an explosive and may be classified under Chapter 36; below 12.6% it is classified under 3912.20. Accurate nitrogen content must be provided during declaration to avoid classification errors. How is cellulose nitrate solution classified? If cellulose nitrate is dissolved in volatile organic solvents (such as ethanol, acetone) and the solvent content exceeds a certain proportion, it may be classified under 3912.20; but if made into collodion, it still falls under 3912.20. Judgment must be based on specific composition and state. Is cellulose nitrate waste classified under 3912? Waste is usually not classified under 3912, but may be classified under 3915 (waste and scrap of plastics). However, if the waste is in primary forms and recyclable, it must be determined based on actual state and use; it is recommended to consult customs. What special documents are required for importing cellulose nitrate? In addition to regular customs declaration documents, dangerous goods transport certificates, composition test reports, certificates of origin, etc., may be required. The specifics depend on nitrogen content and use; it is recommended to confirm with a customs broker in advance. What is the difference in classification between cellulose nitrate and cellulose acetate? Both belong to 3912, but different subheadings: cellulose nitrate is 3912.20, cellulose acetate is 3912.11 or 3912.12 (depending on plasticizer content). Classification must be distinguished based on the type of chemical derivative. If cellulose nitrate is mixed with other polymers, how is it classified? If after mixing, cellulose nitrate is still the main component, it may still be classified under 3912.20; if after mixing it forms other polymers, it is classified according to the main component. Determination must be based on mixing ratio and customs classification rules.