Chapter 39 is the HS classification category for plastics and articles thereof, covering polymers in primary forms (such as resins, pellets, powders), and semi-finished and finished plastic products other than synthetic rubber. This chapter is divided by polymer origin (natural/synthetic) and processing stage: the first part (3901-3914) covers plastics in primary forms, and the latter part (3915-3926) covers waste and scrap and finished products. Expandable polystyrene, as a synthetic resin raw material, falls within the scope of 3901-3914. Heading 3903 specifically covers styrene polymers in primary forms, including polystyrene (PS), styrene-acrylonitrile copolymer (SAN), acrylonitrile-butadiene-styrene copolymer (ABS), etc. This heading is further subdivided by product form and modification type: 3903.11 is expandable polystyrene (EPS), 3903.19 is other polystyrene, and 3903.20 and later are copolymers. EPS has special physical properties due to its blowing agent content and is listed separately. Code 390311 has 6 digits: the first 2 digits "39" are the chapter, representing plastics and articles thereof; digits 3-4 "03" are the heading, representing styrene polymers in primary forms; digits 5-6 "11" are the subheading, representing expandable polystyrene. Among them, the 5th digit "1" indicates polystyrene type, and the 6th digit "1" specifically indicates expandable. This subheading applies only to unexpanded EPS in primary form, i.e., beads or pellets containing a physical blowing agent (such as pentane) that can expand upon heating. If pre-expanded or molded, it is classified under other headings. The product is expandable polystyrene beads in primary form, unexpanded, containing a blowing agent, and fully conforms to the description of 3903.11. It does not belong to 3903.19 (other polystyrene, such as general-purpose GPPS or high-impact HIPS), because the latter does not contain a blowing agent and is not expandable; nor does it belong to 3903.20 (SAN) or 3903.30 (ABS), because its polymer monomer is only styrene. If it has been expanded into blocks or molded, it should be classified under article headings such as 3921 or 3926.
Chapter
Chapter 39 is the HS classification category for plastics and articles thereof, covering polymers in primary forms (such as resins, pellets, powders), and semi-finished and finished plastic products other than synthetic rubber. This chapter is divided by polymer origin (natural/synthetic) and processing stage: the first part (3901-3914) covers plastics in primary forms, and the latter part (3915-3926) covers waste and scrap and finished products. Expandable polystyrene, as a synthetic resin raw material, falls within the scope of 3901-3914.
Heading
Heading 3903 specifically covers styrene polymers in primary forms, including polystyrene (PS), styrene-acrylonitrile copolymer (SAN), acrylonitrile-butadiene-styrene copolymer (ABS), etc. This heading is further subdivided by product form and modification type: 3903.11 is expandable polystyrene (EPS), 3903.19 is other polystyrene, and 3903.20 and later are copolymers. EPS has special physical properties due to its blowing agent content and is listed separately.
Digit Breakdown
Code 390311 has 6 digits: the first 2 digits "39" are the chapter, representing plastics and articles thereof; digits 3-4 "03" are the heading, representing styrene polymers in primary forms; digits 5-6 "11" are the subheading, representing expandable polystyrene. Among them, the 5th digit "1" indicates polystyrene type, and the 6th digit "1" specifically indicates expandable. This subheading applies only to unexpanded EPS in primary form, i.e., beads or pellets containing a physical blowing agent (such as pentane) that can expand upon heating. If pre-expanded or molded, it is classified under other headings.
Classification Basis
The product is expandable polystyrene beads in primary form, unexpanded, containing a blowing agent, and fully conforms to the description of 3903.11. It does not belong to 3903.19 (other polystyrene, such as general-purpose GPPS or high-impact HIPS), because the latter does not contain a blowing agent and is not expandable; nor does it belong to 3903.20 (SAN) or 3903.30 (ABS), because its polymer monomer is only styrene. If it has been expanded into blocks or molded, it should be classified under article headings such as 3921 or 3926.
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