HS code 2835.31: Polyphosphates, sodium triphosphate (sodium tripolyphosphate)
Last updated
Key facts
- HS code
- 2835.31
- Covers
- Polyphosphates, sodium triphosphate (sodium tripolyphosphate)
- Edition
- HS2022
- Duty rates
- Set by each country’s tariff
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.
What this code covers
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.
What it doesn’t cover
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.
- 2835.10Phosphinates (hypophosphites) and phosphonates (phosphites)
- 2835.22Phosphates: Of mono- or disodium
- 2835.24Phosphates: Of potassium
- 2835.25Phosphates: Calcium hydrogenorthophosphate (“dicalcium phosphate”)
- 2835.26Phosphates: Other phosphates of calcium
- 2835.29Phosphates: Other
- 2835.39Polyphosphates: Other
How it is structured
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.
- Within the heading
- Polyphosphates
- Subheading 2835.31
- Sodium triphosphate (sodium tripolyphosphate)
In other countries
No national tariff lines under 2835.31 are live on border.bot yet. Tariffs built on the Harmonized System (HS2022) use 2835.31 at six digits and add their own digits after it.
Frequently asked questions
What does HS code 2835.31 cover?
HS code 2835.31 covers polyphosphates, sodium triphosphate (sodium tripolyphosphate).
Which heading and chapter is HS code 2835.31 in?
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).
Where are goods of heading 28.35 classified when 2835.31 doesn’t fit?
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.
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.