Thermoplastic Natural Rubber (TPNR)
TPNR dynamically vulcanizes natural rubber within thermoplastic matrix, creating processable pellets for injection molding. Primary pellet form. Blends chemically cross-linked qualify as modified natural polymer under 3913.90.1000.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If PP matrix dominates >50% with minor NR
Predominant monomer (propylene) determines classification per subheading note (a)(4).
If unvulcanized blend without thermoplastic processing
Unvulcanized latex/rubber mixes stay under synthetic/natural rubber additions in 4002.
If PET/NR thermoplastic composite
Plates/sheets of polymers other than specified take precedence over primary forms.
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Import Tips & Compliance
• Composition breakdown must show natural rubber phase >50% with documented vulcanization
• Microscopy evidence of co-continuous morphology prevents synthetic polymer misclassification
• Specify pellet size <5mm to confirm primary form vs. finished shapes
Related Products under HTS 3913.90.10.00
Chloroprene Rubber (CR)
Chloroprene rubber, a synthetic elastomer produced by polymerization of chloroprene (2-chloro-1,3-butadiene), is a chemical derivative of natural rubber isoprene structure. It is supplied in primary forms such as bales or pellets for use in manufacturing weather-resistant products like wetsuits and hoses. Classified under HTS 3913.90.1000 as it qualifies as a chemical derivative of natural rubber per chapter notes on polymers.
Cyclized Rubber (Alkylated Chlorosulfonated Rubber)
Cyclized rubber is produced by treating natural rubber with sulfuric acid or other agents to create cyclic structures, yielding a harder derivative used in paints and varnishes. It appears in primary flake or powder form. Falls under HTS 3913.90.1000 as a chemical derivative of natural rubber not elsewhere specified.
Hydroxyl-Terminated Polyisoprene (HTPI)
HTPI is a telechelic natural rubber derivative with hydroxyl end-groups, used as a reactive prepolymer in polyurethane elastomers and adhesives. Supplied as viscous liquid or solid in drums. HTS 3913.90.1000 covers this chemically modified natural rubber in primary form.
Epoxidized Natural Rubber (ENR)
ENR results from partial epoxidation of natural rubber's double bonds, improving oil resistance for tire compounds and adhesives. Available in latex or solid bale primary forms. Chemical modification places it definitively under HTS 3913.90.1000.
Gutta-Percha Resin
Gutta-percha, a trans-1,4-polyisoprene from Palaquium trees, is chemically similar to natural rubber but more rigid; used in golf balls and dental applications. Processed into primary resin pellets. As a natural polymer chemical derivative, it fits HTS 3913.90.1000.
Maleated Natural Rubber (MNR)
MNR features maleic anhydride grafted onto natural rubber backbone for better adhesion in rubber composites. Supplied as primary crumb or powder. Grafting qualifies it as chemical derivative under HTS 3913.90.1000.