# HS code 4002.39: Isobutene-isoprene (butyl) rubber (IIR); halo-isobutene-isoprene rubber (CIIR or BIIR) > HS code 4002.39 covers isobutene-isoprene (butyl) rubber (IIR); halo-isobutene-isoprene rubber (CIIR or BIIR), other than those classified in 4002.31. It sits in heading 40.02 (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) in chapter 40 (rubber and articles thereof). Other goods of heading 40.02 are classified under 4002.11 (styrene-butadiene rubber (SBR); carboxylated styrene-butadiene rubber (XSBR), latex), 4002.19 (styrene-butadiene rubber (SBR); carboxylated styrene-butadiene rubber (XSBR), other), 4002.20 (butadiene rubber (BR)), 4002.31 (isobutene-isoprene (butyl) rubber (IIR); halo-isobutene-isoprene rubber (CIIR or BIIR), isobutene-isoprene (butyl) rubber (IIR)) or 9 others. Source: https://staging.border.bot/hs-codes/400239 Last updated: 13 October 2026 [HS codes](https://staging.border.bot/hs-codes) / [Chapter 40](https://staging.border.bot/hs-codes/40) / [40.02](https://staging.border.bot/hs-codes/4002) / [4002.39](https://staging.border.bot/hs-codes/400239) ## Key facts - HS code: 4002.39 - Covers: Isobutene-isoprene (butyl) rubber (IIR); halo-isobutene-isoprene rubber (CIIR or BIIR) - Heading: [40.02: 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](https://staging.border.bot/hs-codes/4002) - Chapter: [40: Rubber and articles thereof](https://staging.border.bot/hs-codes/40) - Edition: HS2022 - Duty rates: [Set by each country’s tariff](https://staging.border.bot/countries) ## What this code covers HS code 4002.39 covers isobutene-isoprene (butyl) rubber (IIR); halo-isobutene-isoprene rubber (CIIR or BIIR), other than those classified in 4002.31. The legal text of the subheading is “Isobutene-isoprene (butyl) rubber (IIR); halo-isobutene-isoprene rubber (CIIR or BIIR): Other”, read under “Isobutene-isoprene (butyl) rubber (IIR); halo-isobutene-isoprene rubber (CIIR or BIIR)”, in HS2022. ## What it doesn’t cover Other goods of heading 40.02 are classified under 4002.11 (styrene-butadiene rubber (SBR); carboxylated styrene-butadiene rubber (XSBR), latex), 4002.19 (styrene-butadiene rubber (SBR); carboxylated styrene-butadiene rubber (XSBR), other), 4002.20 (butadiene rubber (BR)), 4002.31 (isobutene-isoprene (butyl) rubber (IIR); halo-isobutene-isoprene rubber (CIIR or BIIR), isobutene-isoprene (butyl) rubber (IIR)) or 9 others. - [4002.11](https://staging.border.bot/hs-codes/400211) Styrene-butadiene rubber (SBR); carboxylated styrene-butadiene rubber (XSBR): Latex - [4002.19](https://staging.border.bot/hs-codes/400219) Styrene-butadiene rubber (SBR); carboxylated styrene-butadiene rubber (XSBR): Other - [4002.20](https://staging.border.bot/hs-codes/400220) Butadiene rubber (BR) - [4002.31](https://staging.border.bot/hs-codes/400231) Isobutene-isoprene (butyl) rubber (IIR); halo-isobutene-isoprene rubber (CIIR or BIIR): Isobutene-isoprene (butyl) rubber (IIR) - [4002.41](https://staging.border.bot/hs-codes/400241) Chloroprene (chlorobutadiene) rubber (CR): Latex - [4002.49](https://staging.border.bot/hs-codes/400249) Chloroprene (chlorobutadiene) rubber (CR): Other - [4002.51](https://staging.border.bot/hs-codes/400251) Acrylonitrile-butadiene rubber (NBR): Latex - [4002.59](https://staging.border.bot/hs-codes/400259) Acrylonitrile-butadiene rubber (NBR): Other - [4002.60](https://staging.border.bot/hs-codes/400260) Isoprene rubber (IR) - [4002.70](https://staging.border.bot/hs-codes/400270) Ethylene-propylene-non-conjugated diene rubber (EPDM) - [4002.80](https://staging.border.bot/hs-codes/400280) Mixtures of any product of heading 40.01 with any product of this heading - [4002.91](https://staging.border.bot/hs-codes/400291) Other: Latex - [4002.99](https://staging.border.bot/hs-codes/400299) Other: Other ## How it is structured 4002.39 is a six-digit subheading. Its first two digits, 40, are the chapter; the first four, 4002, are heading 40.02; the last two, 39, identify the subheading within the heading. Countries add their own digits after these six for their national tariff lines. - Chapter 40: Rubber and articles thereof - Heading 40.02: 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 - Within the heading: Isobutene-isoprene (butyl) rubber (IIR); halo-isobutene-isoprene rubber (CIIR or BIIR) - Subheading 4002.39: Other ## In other countries No national tariff lines under 4002.39 are live on border.bot yet. Tariffs built on the Harmonized System (HS2022) use 4002.39 at six digits and add their own digits after it. - Previous subheading: [4002.31](https://staging.border.bot/hs-codes/400231) Isobutene-isoprene (butyl) rubber (IIR); halo-isobutene-isoprene rubber (CIIR or BIIR): Isobutene-isoprene (butyl) rubber (IIR) - Next subheading: [4002.41](https://staging.border.bot/hs-codes/400241) Chloroprene (chlorobutadiene) rubber (CR): Latex ## Frequently asked questions ### What does HS code 4002.39 cover? HS code 4002.39 covers isobutene-isoprene (butyl) rubber (IIR); halo-isobutene-isoprene rubber (CIIR or BIIR), other than those classified in 4002.31. ### Which heading and chapter is HS code 4002.39 in? HS code 4002.39 is in heading 40.02 (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) in chapter 40 (rubber and articles thereof). ### Where are goods of heading 40.02 classified when 4002.39 doesn’t fit? Other goods of heading 40.02 are classified under 4002.11 (styrene-butadiene rubber (SBR); carboxylated styrene-butadiene rubber (XSBR), latex), 4002.19 (styrene-butadiene rubber (SBR); carboxylated styrene-butadiene rubber (XSBR), other), 4002.20 (butadiene rubber (BR)), 4002.31 (isobutene-isoprene (butyl) rubber (IIR); halo-isobutene-isoprene rubber (CIIR or BIIR), isobutene-isoprene (butyl) rubber (IIR)) or 9 others. ## Sources and updates The Harmonized System legal text comes from border.bot release 1 (edition HS 2022), imported from a file, and has been live since 13 October 2026. This page was last updated on 13 October 2026. Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling. Machine-readable: https://staging.border.bot/hs-codes/400239.json