{
  "summary": "HS code 3912.31 covers cellulose ethers, carboxymethylcellulose and its salts. It sits in heading 39.12 (cellulose and its chemical derivatives, not elsewhere specified or included, in primary forms) in chapter 39 (plastics and articles thereof). Other goods of heading 39.12 are classified under 3912.11 (cellulose acetates, non-plasticised), 3912.12 (cellulose acetates, plasticised), 3912.20 (cellulose nitrates (including collodions)), 3912.39 (cellulose ethers, other) or 1 other. National tariff lines under 3912.31 are live on border.bot for the United States (2 lines, also used by 1 other country).",
  "updatedAt": "2026-10-11",
  "facts": [
    {
      "label": "HS code",
      "value": "3912.31",
      "source": "border.bot release GLOBAL:hs #2"
    },
    {
      "label": "Covers",
      "value": "Cellulose ethers, carboxymethylcellulose and its salts",
      "source": "border.bot release GLOBAL:hs #2"
    },
    {
      "label": "Heading",
      "value": "39.12: Cellulose and its chemical derivatives, not elsewhere specified or included, in primary forms",
      "source": "border.bot release GLOBAL:hs #2",
      "url": "https://border.bot/hs-codes/3912"
    },
    {
      "label": "Chapter",
      "value": "39: Plastics and articles thereof",
      "source": "border.bot release GLOBAL:hs #2",
      "url": "https://border.bot/hs-codes/39"
    },
    {
      "label": "Edition",
      "value": "HS2022",
      "source": "border.bot release GLOBAL:hs #2"
    },
    {
      "label": "Duty in the United States",
      "value": "See its 2 lines",
      "source": null,
      "url": "https://border.bot/countries/united-states/hs-codes/391231"
    }
  ],
  "faq": [
    {
      "question": "What does HS code 3912.31 cover?",
      "answer": "HS code 3912.31 covers cellulose ethers, carboxymethylcellulose and its salts."
    },
    {
      "question": "Which heading and chapter is HS code 3912.31 in?",
      "answer": "HS code 3912.31 is in heading 39.12 (cellulose and its chemical derivatives, not elsewhere specified or included, in primary forms) in chapter 39 (plastics and articles thereof)."
    },
    {
      "question": "Where are goods of heading 39.12 classified when 3912.31 doesn’t fit?",
      "answer": "Other goods of heading 39.12 are classified under 3912.11 (cellulose acetates, non-plasticised), 3912.12 (cellulose acetates, plasticised), 3912.20 (cellulose nitrates (including collodions)), 3912.39 (cellulose ethers, other) or 1 other."
    },
    {
      "question": "Which countries’ tariffs list national lines under HS code 3912.31?",
      "answer": "National tariff lines under 3912.31 are live on border.bot for the United States (2 lines, also used by 1 other country)."
    }
  ],
  "sections": [
    {
      "id": "covers",
      "title": "What this code covers",
      "text": [
        "HS code 3912.31 covers cellulose ethers, carboxymethylcellulose and its salts.",
        "The legal text of the subheading is “Cellulose ethers: Carboxymethylcellulose and its salts”, read under “Cellulose ethers”, in HS2022."
      ]
    },
    {
      "id": "not-covered",
      "title": "What it doesn’t cover",
      "text": [
        "Other goods of heading 39.12 are classified under 3912.11 (cellulose acetates, non-plasticised), 3912.12 (cellulose acetates, plasticised), 3912.20 (cellulose nitrates (including collodions)), 3912.39 (cellulose ethers, other) or 1 other."
      ]
    },
    {
      "id": "structure",
      "title": "How it is structured",
      "text": [
        "3912.31 is a six-digit subheading. Its first two digits, 39, are the chapter; the first four, 3912, are heading 39.12; the last two, 31, identify the subheading within the heading.",
        "Countries add their own digits after these six for their national tariff lines."
      ]
    },
    {
      "id": "other-countries",
      "title": "In other countries",
      "text": [
        "National tariff lines under 3912.31 are live on border.bot for the United States (2 lines, also used by 1 other country)."
      ]
    },
    {
      "id": "sources",
      "title": "Sources and updates",
      "text": [
        "The Harmonized System legal text comes from border.bot release 2 (edition HS 2022), imported from a file, and has been live since 11 October 2026.",
        "This page was last updated on 11 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."
      ]
    }
  ],
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    "type": "hs-subheading",
    "edition": "HS2022",
    "chapter": {
      "code": "39",
      "description": "Plastics and articles thereof"
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    "heading": {
      "code": "3912",
      "description": "Cellulose and its chemical derivatives, not elsewhere specified or included, in primary forms"
    },
    "subheading": {
      "code": "391231",
      "description": "Cellulose ethers: Carboxymethylcellulose and its salts",
      "levels": [
        "Cellulose ethers",
        "Carboxymethylcellulose and its salts"
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      "english": null,
      "keywords": []
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    "siblings": [
      {
        "code": "391211",
        "description": "Cellulose acetates: Non-plasticised"
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      {
        "code": "391212",
        "description": "Cellulose acetates: Plasticised"
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      {
        "code": "391220",
        "description": "Cellulose nitrates (including collodions)"
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      {
        "code": "391239",
        "description": "Cellulose ethers: Other"
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      {
        "code": "391290",
        "description": "Other"
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    "related": [],
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      "description": "Cellulose nitrates (including collodions)",
      "indexable": true
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    "schedules": [
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        "code": "US",
        "name": "United States",
        "slug": "united-states",
        "lines": 2,
        "members": 1
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    "provenance": [
      {
        "dataset": "GLOBAL:hs",
        "country": "GLOBAL",
        "kind": "hs",
        "seq": 2,
        "version": "mytraddal hs2022.csv (HS 2022)",
        "liveAt": "2026-10-11T06:04:17.693Z",
        "origin": "upload",
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  "code": "391231",
  "attribution": "border.bot tariff reference (border.bot), compiled from the official publishers named on each page.",
  "terms": "https://border.bot/legal/terms",
  "notice": "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.",
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