Isobutene-isoprene (butyl) rubber (IIR)
Synthetic rubber and factice derived from oils, in primary forms or in plates, sheets or strip; mixtures of any product of heading 4001 with any product of this heading, in primary forms or in plates, sheets or strip: > Isobutene-isoprene (butyl) rubber (IIR); halo-isobutene-isoprene rubber (CIIR or BIIR): > Isobutene-isoprene (butyl) rubber (IIR)
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Products classified under HTS 4002.31.00.00
Butyl Rubber Latex Dispersion
A liquid dispersion of isobutene-isoprene (butyl) rubber (IIR) in water, used for dipping and coating applications in manufacturing gloves and balloons. It qualifies under HTS 4002.31.00.00 as synthetic rubber in primary form (latex), meeting chapter note definitions for prevulcanized dispersions without prohibited compounding agents.
Exxon Butyl 268 Rubber Bale
Baled isobutene-isoprene rubber (IIR) in bulk form, grade Butyl 268 from ExxonMobil, suitable for tire inner liners and pharmaceutical stoppers. Classified under 4002.31.00.00 as synthetic rubber in primary bale form, unvulcanized and uncompounded beyond allowed stabilizers.
Lanxess Butyl 301 Rubber Granules
Granular isobutene-isoprene (butyl) rubber grade 301 from Lanxess, in primary crumb form for easy processing into seals and gaskets. Falls under HTS 4002.31.00.00 per chapter note 3(b) for granules as primary forms of synthetic rubber, without disallowed additives.
Butyl Rubber Powder for Tire Liners
Fine powder form of IIR butyl rubber used in tire inner liner compounds, supplied in bulk bags. HTS 4002.31.00.00 applies as synthetic rubber in primary powder form per chapter note 3(b), retaining raw material character.
Bayer Butyl NC 229 Rubber Solution
Solution of IIR butyl rubber grade NC 229 from Bayer in organic solvent, for coating applications. Under 4002.31.00.00 as primary solution form of synthetic rubber, with solvents permitted if retaining raw character.
High Molecular Weight Butyl Rubber Crumbs
Crumbs of high MW isobutene-isoprene rubber for blending in conveyor belts. HTS 4002.31.00.00 for primary crumb form, complying with synthetic rubber vulcanization and recovery tests in chapter note 2(a).
Butyl Rubber for Pharmaceutical Stoppers
Pure IIR butyl rubber bales optimized for vial stoppers in pharma packaging. Classified 4002.31.00.00 as primary form synthetic rubber, essential for gas impermeability in medical uses.
Liquid Butyl Rubber for Sealants
Low-viscosity liquid IIR for sealant formulations, in drums. HTS 4002.31.00.00 as primary liquid form of butyl rubber, uncompounded.
Butyl VM-613 Granules
VM-613 grade butyl rubber granules from Lion Elastomers for vibration mounts. Primary granule form under 4002.31.00.00.
Isoprene-Isobutene Copolymer Bale
Standard IIR copolymer rubber bales for general molding. HTS 4002.31.00.00 primary bale.
Butyl Rubber Dispersion for Dipping
Aqueous IIR dispersion for latex dipping processes. Primary form 4002.31.00.00.
Polymerized Isobutylene Rubber Powder
Powdered polymerized isobutylene-isoprene for powders. 4002.31.00.00 primary.
Unvulcanized Butyl Rubber Blocks
Irregular blocks of unvulcanized IIR for custom molding. Primary bulk 4002.31.00.00.
Prevulcanized Butyl Rubber Paste
Paste form of prevulcanized isobutene-isoprene rubber (IIR) for adhesive applications, explicitly allowed under chapter notes. Classified in 4002.31.00.00 as primary paste form without prohibited vulcanizing agents beyond prevulcanization.
IIR Butyl Rubber Lumps for Seals
Irregular lumps of unprocessed isobutene-isoprene (butyl) rubber for industrial seal production. Meets HTS 4002.31.00.00 as primary bulk form per chapter note 3(b), unadulterated synthetic rubber.