Heading 2835

Phosphinates (hypophosphites), phosphonates (phosphites) and phosphates; polyphosphates, whether or not chemically defined

12 declarable lines

Heading 2835 covers phosphinates (hypophosphites), phosphonates (phosphites), phosphates, and polyphosphates, whether or not chemically defined. It is split first between phosphinates/phosphonates and phosphates, then within phosphates by cation and type, and within polyphosphates between sodium triphosphate and other polyphosphates.

Products in this heading

Sodium tripolyphosphate (STPP)
Trisodium phosphate (TSP)
Dicalcium phosphate
Monosodium phosphate
Potassium phosphate
Aluminum phosphate
Triammonium phosphate
Sodium hexametaphosphate

How to choose the right subheading

Decide whether the product is a phosphinate/phosphonate or a phosphate/polyphosphate.
For phosphates, identify the cation, such as sodium, potassium, calcium, aluminum, triammonium, or trisodium.
For sodium phosphates, check whether it is mono- or disodium, trisodium, or sodium triphosphate.
For polyphosphates, check whether it is sodium triphosphate or another polyphosphate, and identify the cation if other.
Use the chemical identity, not the brand name, packaging, or intended use.

Often confused with

Phosphoric acid
It is an acid, not a phosphate salt.
Heading 2809
Diphosphorus pentaoxide
It is a phosphorus oxide, not a phosphate or polyphosphate.
Heading 2809
Phosphides
Phosphides are covered by heading 2853, not by phosphates.
Heading 2853
Ammonium phosphate fertilizer
Fertilizer goods in chapter 31 are not classified as separate chemically defined phosphates.
Heading 3105

Frequently asked questions

What is the HTS code for sodium tripolyphosphate?

Sodium tripolyphosphate (sodium triphosphate) is classified under 2835.31.00.00. Its general (MFN) rate is 1.4%.

What is the duty on dicalcium phosphate?

Dicalcium phosphate (calcium hydrogenorthophosphate) is classified under 2835.25.00.00. Its general (MFN) rate is Free.

How do I classify potassium phosphate?

A simple phosphate of potassium is classified under 2835.24.00.00, with a general (MFN) rate of 3.1%. A polyphosphate of potassium is classified under 2835.39.10.00, with a general (MFN) rate of 3.1%.

Guide written from the official schedule text. Rates quoted are general (MFN) rates; check the line page for trade agreement rates and the classification of your exact product.