Syndiotactic Polystyrene Pellets (SPS)
Syndiotactic Polystyrene (SPS) features crystalline structure from stereospecific polymerization, classified in primary pellet form under HTS 3903.19.00.00 as other polystyrene. Used in high-heat engineering applications like automotive parts.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If polyester-modified syndiotactic variant
Aromatic polyester incorporation changes to polyester heading.
If copolymer with vinyl chloride predominance
Subheading notes require classification by weight-dominant monomer.
If pre-compounded into finished profiles
Processed beyond primary form into articles of other plastics.
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Import Tips & Compliance
• Submit polymerization process details confirming stereoregularity without comonomers
• High glass transition temp (100°C+) helps distinguish from general GPPS
• Avoid declaring as 'specialty polymer' without COA, risking 3904 classification
Related Products under HTS 3903.19.00.00
High Impact Polystyrene Resin (HIPS)
High Impact Polystyrene (HIPS) is a copolymer of styrene and butadiene, with butadiene content typically under 5% by weight, making it a polystyrene under HTS 3903.19.00.00 as it does not meet specific copolymer subheadings. It is supplied in primary pellet form for injection molding into durable consumer goods like toys and appliance housings.
General Purpose Polystyrene Pellets (GPPS)
General Purpose Polystyrene (GPPS) is a homopolymer of styrene in transparent pellet form, classified under HTS 3903.19.00.00 as 'other' polystyrene not specified elsewhere. Used primarily for packaging, disposable cups, and clear plastic cases due to its clarity and rigidity.
Polystyrene Compounding Base Resin
Narrow molecular weight distribution polystyrene resin designed for compounding, imported in primary form under HTS 3903.19.00.00. Serves as base for custom blends in electronics and packaging industries.
Injection Molding Polystyrene Resin
High flow polystyrene resin for precision injection molding of household items, falling under HTS 3903.19.00.00 as other polystyrene in primary forms. Balanced viscosity for complex thin-wall parts.
Atactic Polystyrene Granules
Atactic Polystyrene is an amorphous, non-crystalline polystyrene variant in granule form, falling under HTS 3903.19.00.00 as other polystyrene in primary forms. It serves as a blend modifier for improving clarity and impact in other plastics.
Crystal Polystyrene Resin
Crystal Polystyrene, a clear GPPS variant, is imported as resin pellets under HTS 3903.19.00.00 for applications requiring optical clarity like CD cases and medical labware. Meets 'other' polystyrene criteria with over 95% styrene monomer units.