HS Code for STPP

STPP, or Sodium Triphosphate (also known as sodium tripolyphosphate), is classified under HS code 2835.31. This classification falls under Chapter 28, which covers inorganic chemicals and precious metal compounds. Heading 2835 is dedicated to phosphinates (hypophosphites), phosphonates (phosphites), and phosphates, including polyphosphates. STPP is a polyphosphate, and subheading 2835.31 specifically identifies 'Sodium triphosphate (sodium tripolyphosphate).' This chemical is widely used in industrial applications, most notably as a builder in domestic and industrial detergents, and as a preservative in the food industry. The classification is based on its chemical structure as a salt of triphosphoric acid. Whether the product is in its anhydrous form or the hexahydrate form, it remains under this specific subheading as long as it is a separate chemically defined compound.

Products Included

• Technical grade sodium tripolyphosphate
• Food grade sodium triphosphate
• Anhydrous STPP powder
• STPP hexahydrate
• Granular sodium triphosphate for detergents

Common Misclassification

A common misclassification for STPP is HS code 3402.20 or 3402.90, which covers detergent preparations. While STPP is a major component of many detergents, the pure chemical itself must be classified in Chapter 28. Only when it is mixed with surfactants and other additives to form a finished cleaning product does it move to Chapter 34. Another error is confusing it with other sodium phosphates, such as Disodium Phosphate, which is classified under 2835.22. It is critical to distinguish between simple phosphates (orthophosphates) and polyphosphates like STPP to ensure the correct subheading is applied.

FAQ

What is the HS code for STPP?

The HS code for Sodium Triphosphate (STPP) is 2835.31.

Does food-grade STPP have a different HS code?

No, both technical-grade and food-grade sodium triphosphate are classified under HS code 2835.31 as they are the same chemical compound.