HS Code 283531
Sodium triphosphate
Official description: Phosphinates (hypophosphites), phosphonates (phosphites) and phosphates; polyphosphates, whether or not chemically defined : Polyphosphates : Sodium triphosphate (sodium tripolyphosphate)
Also searched as: sodium tripolyphosphate, STPP, sodium triphosphate
Classification
How 283531 breaks down
Inorganic chemicals; compounds of precious metals and isotopes
Phosphinates (hypophosphites), phosphonates (phosphites) and phosphates; polyphosphates, whether or not chemically defined
Sodium triphosphate (sodium tripolyphosphate)
Covered products
What products fall under HS code 283531?
Buyers sourcing sodium triphosphate from 1688 commonly describe it in these ways. If your product matches, 283531 is likely the right 6-digit starting point — confirm material and intended use against the official tariff.
Import duty by market
Where to check the import duty for HS 283531
The 6-digit code is universal, but duty, VAT and GST are set by the destination country and depend on the full national tariff line with China as the country of origin. Start from the official source for your market.
United States
USITC / CBP · Harmonized Tariff Schedule (HTS)
European Union
TARIC · Access2Markets
United Kingdom
HMRC · UK Integrated Online Tariff
Canada
CBSA · Canadian Customs Tariff
Australia
ABF · Australian customs tariff
Singapore
Singapore Customs · Singapore Trade Classification (HS)
Compare the real China-origin import tax across markets
Use the HS & import duty checker to estimate duty + VAT/GST for 283531 by destination before you pay a 1688 supplier.
Heading 2835
Other HS codes under 2835
Subheadings in the same 4-digit heading — "Phosphinates (hypophosphites), phosphonates (phosphites) and phosphates; polyphosphates, whether or not chemically defined". If 283531 is not an exact match, one of these may classify your product more precisely.
Questions
HS code 283531: common questions
What is HS code 283531?
HS code 283531 is the World Customs Organization 6-digit HS 2022 subheading for "Phosphinates (hypophosphites), phosphonates (phosphites) and phosphates; polyphosphates, whether or not chemically defined : Polyphosphates : Sodium triphosphate (sodium tripolyphosphate)". The first two digits (28) are the chapter — Inorganic chemicals; compounds of precious metals and isotopes — and digits 3-4 (2835) are the heading. Countries add further digits (8-10) for their national tariff line.
What products fall under HS 283531?
Common products classified under 283531 include sodium tripolyphosphate, STPP, sodium triphosphate and similar items matching sodium triphosphate. The correct code still depends on the product's material, function and intended use.
How do I find the import duty for HS code 283531?
Duty is set by the destination country, not by the 6-digit HS code alone. Start from the official tariff of your market — USITC HTS (US), TARIC / Access2Markets (EU), GOV.UK Trade Tariff (UK), CBSA (Canada), ABF (Australia) or Singapore Customs — and look up the full national code with China as the country of origin.
Is HS code 283531 the same in every country?
The first 6 digits (283531) are the same worldwide under the WCO Harmonized System. Beyond that, each country extends the code (HTS in the US, TARIC in the EU, etc.) and sets its own duty and tax rates.
Can I trust the HS code a 1688 supplier gives me?
Treat a supplier-provided code as a clue, not a final classification. It can be incomplete, China-export-specific, or mismatched to your destination's rules. Verify against the official tariff and your product's actual material and use.
Chapter 28
Explore Inorganic chemicals; compounds of precious metals and isotopes
Sourcing sodium triphosphate from 1688?
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