Chapter 39 covers plastics and articles thereof, including polymers in primary forms, elastomers other than synthetic rubber, and semi-finished and finished plastic products. This chapter classifies according to the chemical structure, source, and processing stage of polymers; primary forms include liquid, paste, block, powder, etc. Heading 3911 covers petroleum resins, coumarone-indene resins, polysulfides, polysulfones, and other polymers not elsewhere specified or included, in primary forms, including chemically modified polymers. These products typically have special properties such as heat resistance and chemical resistance, and are used in specific industrial fields. The first 2 digits 39 represent Chapter 39, plastics and articles thereof; digits 3-4, 11, represent heading 3911, namely petroleum resins, coumarone-indene resins, polysulfides, polysulfones, etc., in primary forms; digits 5-6, 90, are the subheading, indicating other polysulfides, polysulfones, etc., not elsewhere specified or included. The overall code 391190 points to other polysulfides, polysulfones, and similar polymers in primary forms. The goods are polymers such as polysulfides or polysulfones, are synthetic polymers, and are in primary forms, and are not specifically named in other subheadings; therefore, they are classified under 391190. If they were a specifically named polymer such as polyethylene, they would be classified under 3901; if they were waste and scrap, they would be classified under 3915.
Chapter
Chapter 39 covers plastics and articles thereof, including polymers in primary forms, elastomers other than synthetic rubber, and semi-finished and finished plastic products. This chapter classifies according to the chemical structure, source, and processing stage of polymers; primary forms include liquid, paste, block, powder, etc.
Heading
Heading 3911 covers petroleum resins, coumarone-indene resins, polysulfides, polysulfones, and other polymers not elsewhere specified or included, in primary forms, including chemically modified polymers. These products typically have special properties such as heat resistance and chemical resistance, and are used in specific industrial fields.
Digit Breakdown
The first 2 digits 39 represent Chapter 39, plastics and articles thereof; digits 3-4, 11, represent heading 3911, namely petroleum resins, coumarone-indene resins, polysulfides, polysulfones, etc., in primary forms; digits 5-6, 90, are the subheading, indicating other polysulfides, polysulfones, etc., not elsewhere specified or included. The overall code 391190 points to other polysulfides, polysulfones, and similar polymers in primary forms.
Classification Basis
The goods are polymers such as polysulfides or polysulfones, are synthetic polymers, and are in primary forms, and are not specifically named in other subheadings; therefore, they are classified under 391190. If they were a specifically named polymer such as polyethylene, they would be classified under 3901; if they were waste and scrap, they would be classified under 3915.
📝 Declaration Elements
Product name: The specific name of the declared goods, such as polysulfone, polysulfide, etc., and it must correspond to the HS code. Appearance: Describe the primary form, such as powder, granules, liquid, paste, etc. Composition and content: Indicate the type and content of polymer monomers, such as polysulfone content >= 99%. Types of monomer units: List the monomer units constituting the polymer, such as bisphenol A and 4,4'-dichlorodiphenyl sulfone. Grade: The grade or model provided by the manufacturer, such as P-1700. Use: Explain the main application fields, such as electronic components and aerospace parts. Brand: The manufacturer's or trader's brand, such as Solvay, BASF. Model: The specific model or specification, such as injection grade or extrusion grade. Customs declaration example: Product name: polysulfone; Appearance: granules; Composition and content: polysulfone >= 99%, additives <= 1%; Monomer units: bisphenol A, 4,4'-dichlorodiphenyl sulfone; Grade: P-1700; Use: used for electronic connectors; Brand: Solvay; Model: P-1700 NT. Failure to distinguish primary forms from semi-finished products, resulting in incorrect classification under 39.17 or 39.20. Confusing polysulfides with polysulfide rubber, the latter of which should be classified under 4002. Ignoring monomer unit information, making it impossible to determine whether it is polysulfone. Misdeclaring polyethersulfone as polysulfone; the two have different classifications.
Product name
The specific name of the declared goods, such as polysulfone, polysulfide, etc., and it must correspond to the HS code.
⚠️ Misdeclaring as specific varieties such as polyethersulfone or polyphenylsulfone, resulting in incorrect classification.
Appearance
Describe the primary form, such as powder, granules, liquid, paste, etc.
⚠️ Mistaking the primary form for the shape of a semi-finished product or finished article.
Composition and content
Indicate the type and content of polymer monomers, such as polysulfone content >= 99%.
⚠️ Failing to indicate the monomer type and writing only 'polymer'.
Types of monomer units
List the monomer units constituting the polymer, such as bisphenol A and 4,4'-dichlorodiphenyl sulfone.
⚠️ Omitting monomer information, making it impossible to determine classification.
Grade
The grade or model provided by the manufacturer, such as P-1700.
⚠️ The grade does not match the actual goods or is not provided.
Use
Explain the main application fields, such as electronic components and aerospace parts.
⚠️ The description of use is too broad, such as 'industrial use'.
Brand
The manufacturer's or trader's brand, such as Solvay, BASF.
⚠️ The brand is inconsistent with the manufacturer.
Model
The specific model or specification, such as injection grade or extrusion grade.
⚠️ The model is missing or confused with the grade.
Example： Customs declaration example: Product name: polysulfone; Appearance: granules; Composition and content: polysulfone >= 99%, additives <= 1%; Monomer units: bisphenol A, 4,4'-dichlorodiphenyl sulfone; Grade: P-1700; Use: used for electronic connectors; Brand: Solvay; Model: P-1700 NT.
Common Mistakes：
Failure to distinguish primary forms from semi-finished products, resulting in incorrect classification under 39.17 or 39.20.
Confusing polysulfides with polysulfide rubber, the latter of which should be classified under 4002.
Ignoring monomer unit information, making it impossible to determine whether it is polysulfone.
Misdeclaring polyethersulfone as polysulfone; the two have different classifications.
🎯 Classification Logic
The core basis for classification is: 1. The goods are in primary forms; 2. They are synthetic polymers; 3. Their chemical structure is polysulfide or polysulfone, etc.; 4. They are not specifically named in other headings. A comprehensive determination must be made based on composition, monomer units, appearance, etc. 391110 Petroleum resins, coumarone-indene resins, etc.: 391110 specifically refers to petroleum resins, etc., while 391190 covers polysulfides, polysulfones, etc.; their chemical structures are different. 391120 Polysulfone (specifically named): 391120 is the specifically named subheading for polysulfone, but 391190 is for other goods; if polysulfone is already specifically named, it should be classified under 391120. 391190 Other polysulfides, polysulfones, etc.: This code is a residual subheading and applies to polysulfides, polysulfones, etc., not specifically named. 400299 Other synthetic rubber: If polysulfides are rubber-like, they may be classified under 4002, but synthetic polymers in primary forms are classified under 3911. 390799 Other polyesters: Polysulfone is not a polyester; polyesters are classified under 3907, while polysulfone is classified under 3911. Is it in primary form? Is it a synthetic polymer? Does it belong to polysulfides or polysulfones? Is it not specifically named in other subheadings? Is the monomer unit information complete?
Basis
The core basis for classification is: 1. The goods are in primary forms; 2. They are synthetic polymers; 3. Their chemical structure is polysulfide or polysulfone, etc.; 4. They are not specifically named in other headings. A comprehensive determination must be made based on composition, monomer units, appearance, etc.
Confused Codes：
391110 - Petroleum resins, coumarone-indene resins, etc.
391110 specifically refers to petroleum resins, etc., while 391190 covers polysulfides, polysulfones, etc.; their chemical structures are different.
391120 - Polysulfone (specifically named)
391120 is the specifically named subheading for polysulfone, but 391190 is for other goods; if polysulfone is already specifically named, it should be classified under 391120.
391190 - Other polysulfides, polysulfones, etc.
This code is a residual subheading and applies to polysulfides, polysulfones, etc., not specifically named.
400299 - Other synthetic rubber
If polysulfides are rubber-like, they may be classified under 4002, but synthetic polymers in primary forms are classified under 3911.
390799 - Other polyesters
Polysulfone is not a polyester; polyesters are classified under 3907, while polysulfone is classified under 3911.
Self-Check：
✓ Is it in primary form?
✓ Is it a synthetic polymer?
✓ Does it belong to polysulfides or polysulfones?
✓ Is it not specifically named in other subheadings?
✓ Is the monomer unit information complete?
❓ FAQ
How can it be determined whether polysulfone should be classified under 391190 or 391120? If the polysulfone is specifically named under subheading 391120, it should preferentially be classified under 391120; if it is another polysulfone or not specifically named, it should be classified under 391190. The latest HS code table should be consulted for confirmation. What is the difference in classification between polysulfides and polysulfide rubber? If polysulfides are synthetic polymers in primary forms, they are classified under 3911; if they are synthetic rubber, they are classified under 4002. The key difference lies in whether they have rubber elasticity and whether they fall within the scope of rubber. How should composition and content be filled in during declaration? The type and content of polymer monomers should be indicated, such as 'polysulfone >= 99%', and additives should also be listed. Avoid writing only 'polymer' or 'plastic'. Are there regulatory conditions for goods under 391190? Regulatory conditions vary by country, and the latest customs regulations should be consulted. They may usually involve import licenses, environmental protection requirements, etc. It is recommended to consult the local customs before declaration. How can the tax rate for 391190 be checked? Tax rates may change. The latest tax rate information can be obtained through the website of the General Administration of Customs, HS code query tools, or by consulting a customs broker. Under which code should polyethersulfone be classified? Polyethersulfone is usually classified under 391190; if specifically named, it is classified under the corresponding subheading. It must be determined according to the chemical structure and the HS code table. What is the definition of primary forms? Primary forms include liquid, paste, block, powder, granular, etc., unprocessed or only simply processed, such as extrusion pelletizing. If the goods are polysulfone articles, under which code should they be classified? Polysulfone articles should be classified under 39.17 to 39.26, specifically determined according to the type of article, such as plates, sheets, film, etc.
Q: How can it be determined whether polysulfone should be classified under 391190 or 391120?
A: If the polysulfone is specifically named under subheading 391120, it should preferentially be classified under 391120; if it is another polysulfone or not specifically named, it should be classified under 391190. The latest HS code table should be consulted for confirmation.
Q: What is the difference in classification between polysulfides and polysulfide rubber?
A: If polysulfides are synthetic polymers in primary forms, they are classified under 3911; if they are synthetic rubber, they are classified under 4002. The key difference lies in whether they have rubber elasticity and whether they fall within the scope of rubber.
Q: How should composition and content be filled in during declaration?
A: The type and content of polymer monomers should be indicated, such as 'polysulfone >= 99%', and additives should also be listed. Avoid writing only 'polymer' or 'plastic'.
Q: Are there regulatory conditions for goods under 391190?
A: Regulatory conditions vary by country, and the latest customs regulations should be consulted. They may usually involve import licenses, environmental protection requirements, etc. It is recommended to consult the local customs before declaration.
Q: How can the tax rate for 391190 be checked?
A: Tax rates may change. The latest tax rate information can be obtained through the website of the General Administration of Customs, HS code query tools, or by consulting a customs broker.
Q: Under which code should polyethersulfone be classified?
A: Polyethersulfone is usually classified under 391190; if specifically named, it is classified under the corresponding subheading. It must be determined according to the chemical structure and the HS code table.
Q: What is the definition of primary forms?
A: Primary forms include liquid, paste, block, powder, granular, etc., unprocessed or only simply processed, such as extrusion pelletizing.
Q: If the goods are polysulfone articles, under which code should they be classified?
A: Polysulfone articles should be classified under 39.17 to 39.26, specifically determined according to the type of article, such as plates, sheets, film, etc.
⚠️ Disclaimer: HS code classification, declaration elements, tariff rates and regulatory conditions on this page are for reference only and do not constitute legal advice on customs classification. Tariff rates and regulations are subject to change; the latest announcements from the General Administration of Customs and on-site determinations shall prevail. Please consult professional customs brokers or customs authorities before import/export.