Polyisobutylene (PIB) Gum
Polyisobutylene is a synthetic rubber-like polyolefin from isobutylene monomer, imported as viscous liquid or granules under HTS 3902.90.00 for other olefin polymers in primary forms. It qualifies as the isobutylene units exceed 95% by weight. Commonly used in chewing gum base, adhesives, and sealants.
Import Duty Rates by Country of Origin
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If marketed and processed as synthetic rubber
High molecular weight PIB used as rubber falls under Chapter 40, based on end-use and physical properties rather than strict polymer type.
If copolymerized with ethylene where ethylene predominates
Subheading note (a)(4) requires classification by predominant monomer; ethylene-dominant shifts to 3902.20.
If sold as prepared adhesive binder with additives
Polymer mixtures exceeding simple blends are chemical preparations under 3824, not primary polymers.
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Import Tips & Compliance
• Declare exact molecular weight and viscosity to distinguish from rubber alternatives; include MSDS for hazardous liquid forms
• Check for plasticizer content if blended, as it affects subheading per notes
• Use refrigerated containers for low-viscosity grades to prevent solidification
Related Products under HTS 3902.90.00
Polybutene-1 Resin PB-1
Polybutene-1 (PB-1) is a polyolefin polymer derived from butene-1 monomer, classified under HTS 3902.90.00 as it falls within polymers of other olefins in primary forms (pellets or granules). It meets the subheading note requiring the monomer unit to contribute 95% or more by weight. Used in pipes, films, and sealants due to its flexibility and sealability.
Polymethylpentene (PMP) Pellets
Polymethylpentene, a high-clarity polyolefin from 4-methyl-1-pentene monomer, is imported in pellet form under HTS 3902.90.00 as other olefin polymers in primary forms. The monomer contributes over 95% by weight per chapter notes. Ideal for labware, medical devices, and microwave components due to heat resistance.
Poly-4-methyl-1-pentene Granules
Granular poly-4-methyl-1-pentene (TPX) is a semicrystalline olefin polymer used in optical and high-temp applications, classified in HTS 3902.90.00 for primary form olefin polymers beyond propylene. Meets 95% monomer threshold. Offers low density and high transparency.
High-Density Polybutene Pellets
High-density polybutene resin pellets for piping and hot-melt adhesives are olefin polymers under HTS 3902.90.00, as butene-derived in primary granular form with >95% monomer content. Provides superior creep resistance and flexibility.
Isotactic Polybutene Powder
Isotactic polybutene powder, a stereoregular olefin homopolymer, is classified under HTS 3902.90.00 for other olefins in primary powder form suitable for compounding. Monomer purity exceeds chapter note requirements. Applied in sealants and electrical insulation.
Copolymer Polybutene PB-0300 MFI Pellets
PB-0300 copolymer polybutene pellets with 0.3 g/10min MFI for film blowing, classified as other olefin polymers in HTS 3902.90.00 since butene units predominate over 95%. Used in stretch films and medical packaging.