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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If co-extruded with plastics
Plastic articles with rubber components may shift to chapter 39.
If pre-formed into stopper plates
Plate forms worked beyond primary go to 4008.91.
Not sure which classification is right?
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Import Tips & Compliance
• Include USP Class VI certification for pharma end-use
• Ensure no animal-derived processing aids to avoid biotech regs
• Low extractables testing docs prevent health/safety holds
Related Products 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).