What is the difference between phosphinates and phosphonates?
Use this as a comparison hint, then confirm the final decision with legal notes and country-specific rules.
HS-4 · Heading
2835 — Phosphinates (hypophosphites), phosphonates (phosphites), and phosphates; and polyphosphates, whether or not chemically defined
Chapter 28: Inorganic chemicals
Plain-language overview
Use HS-4 2835 when importing phosphinates, phosphonates, or phosphates, such as sodium triphosphate used in food processing. Understanding the specific subheading is crucial for accurate classification and compliance.
When deciding between HS-6 283510 for phosphinates and HS-6 283522 for mono- or disodium phosphates, consider the chemical composition of your product. If your product contains phosphinates, choose 283510; if it’s a mono- or disodium phosphate, then 283522 is appropriate.
If your product is a potassium phosphate, you would use HS-6 283524. However, if it’s a calcium phosphate, you need to determine if it falls under HS-6 283525 for dicalcium phosphate or HS-6 283526 for other calcium phosphates. The specific chemical structure will guide your choice.
For polyphosphates, select HS-6 283531 if your product is sodium triphosphate. If it’s a different type of polyphosphate, such as ammonium polyphosphate, use HS-6 283539. Ensure you verify the chemical definitions to avoid misclassification.
Keywords & topics
Useful terms traders and brokers use for this HS-4 heading.
phosphinates · phosphonates · phosphates · polyphosphates · sodium triphosphate · calcium phosphate · mono- or disodium phosphates · potassium phosphates · chemical definitions · import classification
Examples
Drawn from the official tariff wording for this HS-4 heading. Always confirm against your published schedule and legal notes.
- Sodium triphosphate (used in food processing)
- Calcium hydrogenorthophosphate (dicalcium phosphate, used in dietary supplements)
- Mono- or disodium phosphates (used in baking powder)
- Potassium phosphates (used in fertilizers)
- Phosphinates for flame retardants
- Polyphosphates for detergents
- Phosphonates in water treatment
Common questions
Frequent classification questions with short practical guidance.
How to classify phosphates for import?
Write down material, use, and product form first, then compare nearby lines before you lock the code.
What are the uses of sodium triphosphate?
Use this as a comparison hint, then confirm the final decision with legal notes and country-specific rules.
Which HS code for calcium hydrogenorthophosphate?
Use this as a comparison hint, then confirm the final decision with legal notes and country-specific rules.
Are polyphosphates regulated differently?
Use this as a comparison hint, then confirm the final decision with legal notes and country-specific rules.
How to determine the correct HS-6 subheading?
Match the product to the legal wording, then verify the final pick in your country tariff schedule before filing.
Related topics
Common real-world topics that come up during code comparison.
how to classify phosphinates for import
Check the exact product specs and destination-country tariff notes before finalizing the code.
differences between phosphates and polyphosphates
Compare adjacent HS lines and pick the one that matches material, function, and product form most closely.
importing sodium triphosphate requirements
Check the exact product specs and destination-country tariff notes before finalizing the code.
choosing the right HS code for phosphonates
Use this topic to narrow your shortlist, then validate the final code against legal wording.
understanding phosphates in food processing
Use this topic to narrow your shortlist, then validate the final code against legal wording.
import regulations for calcium phosphates
Check the exact product specs and destination-country tariff notes before finalizing the code.
how to identify phosphinates in products
Use this topic to narrow your shortlist, then validate the final code against legal wording.
Questions & answers
For orientation only—the binding text is your national tariff and the WCO nomenclature your country uses.
- What are phosphinates and how are they used?
- Phosphinates are chemical compounds used in various applications, including flame retardants and agricultural products.
- How do I know if my product is a mono- or disodium phosphate?
- Check the chemical composition; if it contains one or two sodium ions and phosphoric acid, it qualifies as mono- or disodium phosphate.
- What is the significance of chemical definitions in HS classification?
- Chemical definitions help ensure that products are classified correctly, which affects duty rates and compliance with regulations.
- Can I use the same HS code for different types of phosphates?
- No, each type of phosphate has a specific HS code based on its chemical structure, so it's important to choose the correct one.
- What should I do if I'm unsure about the correct HS code?
- Consult with a customs broker or refer to official tariff classification guidelines to ensure accurate classification.
Continue classification
Parent context
Nearby siblings
Next best action
Pick one of these actions to move from reading to a defensible classification decision.
Browse this heading in the lookup
Heading-browse mode uses HS-6 283500 (first line of this block).
HS-6 subheadings (8)
- 283510Phosphinates (hypophosphites) and phosphonates (phosphites), whether or not chemically defined
- 283522Phosphates; of mono- or disodium, whether or not chemically defined
- 283524Phosphates; of potassium, whether or not chemically defined
- 283525Phosphates; calcium hydrogenorthophosphate (dicalcium phosphate), whether or not chemically defined
- 283526Phosphates; of calcium n.e.c. in item no. 2835.25, whether or not chemically defined
- 283529Phosphates; (other than of mono- or disodium, other than of potassium or of calcium hydrogenorthophosphate (dicalcium phosphate) and excluding other phosphates of calcium), whether or not chemically defined
- 283531Polyphosphates; sodium triphosphate (sodium tripolyphosphate), whether or not chemically defined
- 283539Polyphosphates; other than sodium triphosphate (sodium tripolyphosphate), whether or not chemically defined