{
  "summary": "HS code 2835.31 covers polyphosphates, sodium triphosphate (sodium tripolyphosphate). It sits in heading 28.35 (phosphinates (hypophosphites), phosphonates (phosphites) and phosphates; polyphosphates, whether or not chemically defined) in chapter 28 (inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes). Other goods of heading 28.35 are classified under 2835.10 (phosphinates (hypophosphites) and phosphonates (phosphites)), 2835.22 (phosphates, of mono- or disodium), 2835.24 (phosphates, of potassium), 2835.25 (phosphates, calcium hydrogenorthophosphate (“dicalcium phosphate”)) or 3 others. National tariff lines under 2835.31 are live on border.bot for the United States (1 line, also used by 1 other country).",
  "updatedAt": "2026-10-11",
  "facts": [
    {
      "label": "HS code",
      "value": "2835.31",
      "source": "border.bot release GLOBAL:hs #2"
    },
    {
      "label": "Covers",
      "value": "Polyphosphates, sodium triphosphate (sodium tripolyphosphate)",
      "source": "border.bot release GLOBAL:hs #2"
    },
    {
      "label": "Heading",
      "value": "28.35: Phosphinates (hypophosphites), phosphonates (phosphites) and phosphates; polyphosphates, whether or not chemically defined",
      "source": "border.bot release GLOBAL:hs #2",
      "url": "https://border.bot/hs-codes/2835"
    },
    {
      "label": "Chapter",
      "value": "28: Inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes",
      "source": "border.bot release GLOBAL:hs #2",
      "url": "https://border.bot/hs-codes/28"
    },
    {
      "label": "Edition",
      "value": "HS2022",
      "source": "border.bot release GLOBAL:hs #2"
    },
    {
      "label": "Duty in the United States",
      "value": "See its 1 line",
      "source": null,
      "url": "https://border.bot/countries/united-states/hs-codes/283531"
    }
  ],
  "faq": [
    {
      "question": "What does HS code 2835.31 cover?",
      "answer": "HS code 2835.31 covers polyphosphates, sodium triphosphate (sodium tripolyphosphate)."
    },
    {
      "question": "Which heading and chapter is HS code 2835.31 in?",
      "answer": "HS code 2835.31 is in heading 28.35 (phosphinates (hypophosphites), phosphonates (phosphites) and phosphates; polyphosphates, whether or not chemically defined) in chapter 28 (inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes)."
    },
    {
      "question": "Where are goods of heading 28.35 classified when 2835.31 doesn’t fit?",
      "answer": "Other goods of heading 28.35 are classified under 2835.10 (phosphinates (hypophosphites) and phosphonates (phosphites)), 2835.22 (phosphates, of mono- or disodium), 2835.24 (phosphates, of potassium), 2835.25 (phosphates, calcium hydrogenorthophosphate (“dicalcium phosphate”)) or 3 others."
    },
    {
      "question": "Which countries’ tariffs list national lines under HS code 2835.31?",
      "answer": "National tariff lines under 2835.31 are live on border.bot for the United States (1 line, also used by 1 other country)."
    }
  ],
  "sections": [
    {
      "id": "covers",
      "title": "What this code covers",
      "text": [
        "HS code 2835.31 covers polyphosphates, sodium triphosphate (sodium tripolyphosphate).",
        "The legal text of the subheading is “Polyphosphates: Sodium triphosphate (sodium tripolyphosphate)”, read under “Polyphosphates”, in HS2022."
      ]
    },
    {
      "id": "not-covered",
      "title": "What it doesn’t cover",
      "text": [
        "Other goods of heading 28.35 are classified under 2835.10 (phosphinates (hypophosphites) and phosphonates (phosphites)), 2835.22 (phosphates, of mono- or disodium), 2835.24 (phosphates, of potassium), 2835.25 (phosphates, calcium hydrogenorthophosphate (“dicalcium phosphate”)) or 3 others."
      ]
    },
    {
      "id": "structure",
      "title": "How it is structured",
      "text": [
        "2835.31 is a six-digit subheading. Its first two digits, 28, are the chapter; the first four, 2835, are heading 28.35; 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 2835.31 are live on border.bot for the United States (1 line, 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."
      ]
    }
  ],
  "data": {
    "type": "hs-subheading",
    "edition": "HS2022",
    "chapter": {
      "code": "28",
      "description": "Inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes"
    },
    "heading": {
      "code": "2835",
      "description": "Phosphinates (hypophosphites), phosphonates (phosphites) and phosphates; polyphosphates, whether or not chemically defined"
    },
    "subheading": {
      "code": "283531",
      "description": "Polyphosphates: Sodium triphosphate (sodium tripolyphosphate)",
      "levels": [
        "Polyphosphates",
        "Sodium triphosphate (sodium tripolyphosphate)"
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      "english": null,
      "keywords": []
    },
    "siblings": [
      {
        "code": "283510",
        "description": "Phosphinates (hypophosphites) and phosphonates (phosphites)"
      },
      {
        "code": "283522",
        "description": "Phosphates: Of mono- or disodium"
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      {
        "code": "283524",
        "description": "Phosphates: Of potassium"
      },
      {
        "code": "283525",
        "description": "Phosphates: Calcium hydrogenorthophosphate (“dicalcium phosphate”)"
      },
      {
        "code": "283526",
        "description": "Phosphates: Other phosphates of calcium"
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      {
        "code": "283529",
        "description": "Phosphates: Other"
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      {
        "code": "283539",
        "description": "Polyphosphates: Other"
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    "related": [],
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      "description": "Phosphates: Other",
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    "schedules": [
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        "code": "US",
        "name": "United States",
        "slug": "united-states",
        "lines": 1,
        "members": 1
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    "provenance": [
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        "dataset": "GLOBAL:hs",
        "country": "GLOBAL",
        "kind": "hs",
        "seq": 2,
        "version": "mytraddal hs2022.csv (HS 2022)",
        "liveAt": "2026-10-11T06:04:17.693Z",
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  "code": "283531",
  "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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