Code 2835 31 · Heading 2835

Sodium triphosphate (sodium tripolyphosphate), including when not chemically defined

This code covers sodium triphosphate, also called sodium tripolyphosphate. It also covers the product when it is not chemically defined.

For example

Chemically defined sodium triphosphate
Sodium tripolyphosphate that is not chemically defined

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See the official tariff text

Official tariff text

Sodium triphosphate "sodium tripolyphosphate", whether or not chemically defined

The path to this code

Every code is reached through these choices, one level at a time.

Step 4 of 4

Step 1 · Section VI Products of the chemical or allied industries
Is it an inorganic or organic chemical; a pharmaceutical product; a fertilizer; a tanning or dye extract, pigment, paint, varnish, filler or printing ink; an essential oil, perfume, cosmetic or toilet product; soap, a surface-active, washing, cleaning, polishing or wax product; a protein, modified starch, glue or enzyme; an explosive, pyrotechnic article, match or other specified combustible material; a photographic or cinematographic product; or another chemical product?
✓
Step 2 · Chapter 28 Inorganic chemicals; organic or inorganic compounds… 1 of 11 chapters in section VI
Which named chemical or chemical family best describes the product—for example a metal, acid, oxide, salt, isotope, compound or another substance listed under this category?
✓
Step 3 · Heading 2835 Phosphinates "hypophosphites", phosphonates "phosph… 35 of 50 headings under chapter 28
Is it a phosphinate or phosphonate; a phosphate of mono- or disodium, potassium, calcium hydrogen orthophosphate, another calcium phosphate, or another phosphate; sodium triphosphate; or another polyphosphate?
✓
Step 4 · Subheading 2835 31 Sodium triphosphate "sodium tripolyphosphate", whet… 7 of 8 subheadings under heading 2835
Is the product sodium triphosphate (sodium tripolyphosphate), including when it is not chemically defined?

Full 8-digit codes

Pick the description that best matches your product.

1 code below this one

2835 31 00 Sodium triphosphate "sodium tripolyphosphate", whether or not chemically defined 5.5% Save

Compare the sibling codes

2835 10 Phosphinates "hypophosphites" and phosphonates "phosphites" 5.5%
2835 22 Mono- or disodium phosphate 5.5%
2835 24 Phosphates of potassium 5.5%
2835 25 Calcium hydrogenorthophosphate "dicalcium phosphate" 5.5%
2835 26 Phosphates of calcium (excl. calcium hydrogenorthophosphate "dicalcium phosphate") 5.5%
2835 29 Phosphates (excl. phosphates of monosodium, disodium, potassium, calcium and mercury) 5.3–5.5%
2835 31 Sodium triphosphate "sodium tripolyphosphate", whether or not chemically defined you are here 5.5%
2835 39 Polyphosphates, whether or not chemically defined (excl. sodium triphosphate "sodium tripolyphosphate", and inorganic or organic compounds of mercury whether or not chemically defined) 5.5%

Export to Norway

What Norwegian customs charges when goods like these are imported into Norway.

28.35.3100

Sodium triphosphate (sodium tripolyphosphate)

Ordinary duty

Duty free

Goods of EU origin

Duty free You need documentation of EU origin to use this rate.

Norwegian tariff data version 1.5/1.2, last checked Aug. 3, 2026.

Contains data from Norwegian Customs (data.toll.no), licensed under CC BY 4.0, adapted for display.

Export to the United Kingdom

What UK customs charges when goods like these are imported into the UK.

2835 31 00 00

Sodium triphosphate (sodium tripolyphosphate)

Ordinary duty

4.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.

These rates apply in Great Britain. Different rules may apply for goods entering Northern Ireland.

UK tariff data version v4.0.1576, last checked Aug. 3, 2026.

Contains public sector information licensed under the Open Government Licence v3.0.

Source: UK Department for Business and Trade (data.api.trade.gov.uk).

Check the neighbouring codes

The codes just before and after this one, in case a nearby group fits better.

See all 8 codes at this level

Previous code 2835 29

Phosphates (excl. phosphates of monosodium, disodium, potassium, calc…

you are here 2835 31

Sodium triphosphate "sodium tripolyphosphate", whether or not chemica…

Next code 2835 39

Polyphosphates, whether or not chemically defined (excl. sodium triph…

Duty rates shown here are estimates, read from official EU / Danish, Norwegian and UK tariff data for orientation only. Confirm the current rate with SKAT, TARIC, Norwegian Customs or the UK Online Trade Tariff before you file. The rate you pay can also depend on the country of origin. These are base customs duties only: import VAT, excise duties, anti-dumping duties and safeguard or quota measures are not included.