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 40.01 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) > Isobutene-isoprene (butyl) rubber (IIR)
Duty Rate (from China)
Products classified under Tariff item 4002.31.00.00
Bayer Butyl NC 229 Rubber Solution
> A solution of isobutene-isoprene (butyl) rubber (IIR) in an organic solvent, used for coating applications. It is in primary form (liquid) as defined in Chapter Note 3(a) and retains the essential character of raw synthetic rubber, with the solvent permitted under Chapter Note 5(B) as an additive that does not alter classification.
4002.31.00Butyl Rubber Dispersion for Dipping
> An aqueous dispersion of isobutene-isoprene (butyl) rubber (IIR) intended for latex dipping processes. As a liquid dispersion, it qualifies as a primary form under Chapter Note 3(a) and is not compounded beyond the permitted additives, retaining its raw synthetic rubber character for heading 40.02.
4002.31.00Butyl Rubber for Pharmaceutical Stoppers
> Pure isobutene-isoprene (butyl) rubber (IIR) in bale form, optimized for pharmaceutical vial stoppers. It is in primary bulk form (bales) under Chapter Note 3(b) and is not compounded, retaining the essential character of raw synthetic rubber, making it classifiable under tariff item 4002.31.00.
4002.31.00Butyl 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 is a primary form (latex) under Chapter Note 3(a) and meets the definition of synthetic rubber in Chapter Note 4, not being compounded with prohibited substances.
4002.31.00Butyl Rubber Powder for Tire Liners
> Fine powder form of isobutene-isoprene (butyl) rubber (IIR) used in tire inner liner compounds, supplied in bulk bags. Powder is a primary form under Chapter Note 3(b), and the product is uncompounded, meeting the synthetic rubber definition in Chapter Note 4.
4002.31.00Butyl VM-613 Granules
> VM-613 grade butyl rubber granules from Lion Elastomers for vibration mounts. Granules are a primary form under Chapter Note 3(b), and the product is uncompounded synthetic rubber (IIR), classifiable under tariff item 4002.31.00.
4002.31.00Exxon Butyl 268 Rubber Bale
> Baled isobutene-isoprene rubber (IIR), grade Butyl 268 from ExxonMobil, suitable for tire inner liners and pharmaceutical stoppers. Bales are a primary bulk form under Chapter Note 3(b), and the rubber is uncompounded, meeting the synthetic rubber definition in Chapter Note 4.
4002.31.00High Molecular Weight Butyl Rubber Crumbs
> Crumbs of high molecular weight isobutene-isoprene rubber for blending in conveyor belts. Crumbs are a primary form under Chapter Note 3(b), and the rubber is uncompounded, complying with the vulcanization and recovery tests in Chapter Note 4(a).
4002.31.00IIR Butyl Rubber Lumps for Seals
> Irregular lumps of unprocessed isobutene-isoprene (butyl) rubber for industrial seal production. Lumps are a primary bulk form under Chapter Note 3(b), and the rubber is unadulterated synthetic rubber, classifiable under tariff item 4002.31.00.
4002.31.00Isoprene-Isobutene Copolymer Bale
> Standard isobutene-isoprene copolymer rubber bales for general molding applications. Bales are a primary bulk form under Chapter Note 3(b), and the rubber is uncompounded, meeting the synthetic rubber definition in Chapter Note 4.
4002.31.00Lanxess Butyl 301 Rubber Granules
> Granular isobutene-isoprene (butyl) rubber grade 301 from Lanxess, in primary crumb form for easy processing into seals and gaskets. Granules are a primary form under Chapter Note 3(b), and the rubber is uncompounded, classifiable under tariff item 4002.31.00.
4002.31.00Liquid Butyl Rubber for Sealants
> Low-viscosity liquid isobutene-isoprene (butyl) rubber for sealant formulations, in drums. It is a primary form (liquid) under Chapter Note 3(a) and is uncompounded, retaining the essential character of raw synthetic rubber.
4002.31.00Polymerized Isobutylene Rubber Powder
> Powdered polymerized isobutylene-isoprene rubber for various applications. Powder is a primary form under Chapter Note 3(b), and the rubber is uncompounded, meeting the synthetic rubber definition in Chapter Note 4.
4002.31.00Prevulcanized Butyl Rubber Paste
> Paste form of prevulcanized isobutene-isoprene rubber (IIR) for adhesive applications. It is a primary form (paste) under Chapter Note 3(a), and the prevulcanization is permitted under Chapter Note 5(A)(i) as it is prepared for pre-vulcanized rubber latex, retaining classification under tariff item 4002.31.00.
4002.31.00Unvulcanized Butyl Rubber Blocks
> Irregular blocks of unvulcanized isobutene-isoprene (butyl) rubber for custom molding. Blocks are a primary bulk form under Chapter Note 3(b), and the rubber is uncompounded, classifiable under tariff item 4002.31.00.