{
  "summary": "HS code 3913.90 covers natural polymers (for example, alginic acid) and modified natural polymers (for example, hardened proteins, chemical derivatives of natural rubber), not elsewhere specified or included, in primary forms, other than those classified in 3913.10. It sits in heading 39.13 (natural polymers (for example, alginic acid) and modified natural polymers (for example, hardened proteins, chemical derivatives of natural rubber), not elsewhere specified or included, in primary forms) in chapter 39 (plastics and articles thereof). Other goods of heading 39.13 are classified under 3913.10 (alginic acid, its salts or esters).",
  "updatedAt": "2026-10-13",
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      "label": "Covers",
      "value": "Natural polymers (for example, alginic acid) and modified natural polymers (for example, hardened proteins, chemical derivatives of natural rubber), not elsewhere specified or included, in primary forms",
      "source": "border.bot release GLOBAL:hs #1"
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      "label": "Heading",
      "value": "39.13: Natural polymers (for example, alginic acid) and modified natural polymers (for example, hardened proteins, chemical derivatives of natural rubber), not elsewhere specified or included, in primary forms",
      "source": "border.bot release GLOBAL:hs #1",
      "url": "https://staging.border.bot/hs-codes/3913"
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      "label": "Chapter",
      "value": "39: Plastics and articles thereof",
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    {
      "label": "Edition",
      "value": "HS2022",
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      "label": "Duty rates",
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  "faq": [
    {
      "question": "What does HS code 3913.90 cover?",
      "answer": "HS code 3913.90 covers natural polymers (for example, alginic acid) and modified natural polymers (for example, hardened proteins, chemical derivatives of natural rubber), not elsewhere specified or included, in primary forms, other than those classified in 3913.10."
    },
    {
      "question": "Which heading and chapter is HS code 3913.90 in?",
      "answer": "HS code 3913.90 is in heading 39.13 (natural polymers (for example, alginic acid) and modified natural polymers (for example, hardened proteins, chemical derivatives of natural rubber), not elsewhere specified or included, in primary forms) in chapter 39 (plastics and articles thereof)."
    },
    {
      "question": "Where are goods of heading 39.13 classified when 3913.90 doesn’t fit?",
      "answer": "Other goods of heading 39.13 are classified under 3913.10 (alginic acid, its salts or esters)."
    }
  ],
  "sections": [
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      "id": "covers",
      "title": "What this code covers",
      "text": [
        "HS code 3913.90 covers natural polymers (for example, alginic acid) and modified natural polymers (for example, hardened proteins, chemical derivatives of natural rubber), not elsewhere specified or included, in primary forms, other than those classified in 3913.10.",
        "The legal text of the subheading is “Other”, in HS2022."
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    },
    {
      "id": "not-covered",
      "title": "What it doesn’t cover",
      "text": [
        "Other goods of heading 39.13 are classified under 3913.10 (alginic acid, its salts or esters)."
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      "id": "structure",
      "title": "How it is structured",
      "text": [
        "3913.90 is a six-digit subheading. Its first two digits, 39, are the chapter; the first four, 3913, are heading 39.13; the last two, 90, identify the subheading within the heading.",
        "Countries add their own digits after these six for their national tariff lines."
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      "id": "other-countries",
      "title": "In other countries",
      "text": [
        "No national tariff lines under 3913.90 are live on border.bot yet. Tariffs built on the Harmonized System (HS2022) use 3913.90 at six digits and add their own digits after it."
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      "title": "Sources and updates",
      "text": [
        "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."
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    },
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      "description": "Other",
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        "dataset": "GLOBAL:hs",
        "country": "GLOBAL",
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  "code": "391390",
  "attribution": "border.bot tariff reference (border.bot), compiled from the official publishers named on each page.",
  "terms": "https://staging.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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