HS code 283539: Polyphosphates
- Covers:
- Phosphinates (hypophosphites), phosphonates (phosphites) and phosphates; polyphosphates… not listed under the other codes in this heading.
- Not covered:
- 283510 (Phosphinates (hypophosphites) and phosphonates…); 283522 (Phosphates — Of mono- or disodium); 283524 (Phosphates — Of potassium); and others.
- Listed US duty:
- 3.1%–3.7% (US general rate, HTS 2026)
Official description
Phosphinates (hypophosphites), phosphonates (phosphites) and phosphates; polyphosphates, whether or not chemically defined : Polyphosphates : Other
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Suggestions from the HS index, not a customs ruling
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What 283539 covers and what it doesn’t
Official text: Phosphinates (hypophosphites), phosphonates (phosphites) and phosphates; polyphosphates, whether or not chemically defined › Polyphosphates › Other.
This is the “other” line of heading 2835 (phosphinates (hypophosphites), phosphonates (phosphites) and phosphates; polyphosphates, whether or not chemically defined). It takes goods of that heading that no more specific subheading names. These go elsewhere:
- 283510 Phosphinates (hypophosphites) and phosphonates (phosphites)
- 283522 Phosphates — Of mono- or disodium
- 283524 Phosphates — Of potassium
- 283525 Phosphates — Calcium hydrogenorthophosphate (‘dicalcium phosphate’)
- 283526 Phosphates — Other phosphates of calcium
- 283529 Phosphates — Other
- 283531 Polyphosphates — Sodium triphosphate (sodium tripolyphosphate)
Nearby codes to check
- Heading 2835 Phosphinates (hypophosphites), phosphonates (phosphites) and phosphates; polyphosphates, whether or not chemically defined: every subheading side by side.
US duty rate
3.1%–3.7%
General (MFN) rate in the US Harmonized Tariff Schedule, 2026 edition. A range means the rate depends on the 8-digit US line your product falls under. Extra duties such as Section 301, Section 232 or anti-dumping orders can apply on top, depending on origin. Check the lines on hts.usitc.gov. Not legal advice.
Who imports under 283539
EximAgent lists companies with recorded shipments under this code, built from customs records, with who they buy from and how often. See importers of 283539 →
Common questions
- What is HS code 283539?
- Phosphinates (hypophosphites), phosphonates (phosphites) and phosphates; polyphosphates, whether or not chemically defined : Polyphosphates : Other
- What duty rates apply to 283539?
- Listed US duty: 3.1%–3.7% (US general rate, HTS 2026).
Go beyond the code
Classify a product and check the duty for your destination with the CLI, then keep researching in your own agent.