Sodium Tripolyphosphate (STPP)
Sodium tripolyphosphate is a polyphosphate salt used as a builder in detergents and for water softening in food processing. It falls under HTS 2835.29.51.00 as a polyphosphate, chemically defined inorganic compound of phosphorus. This classification applies to its anhydrous or hydrated forms used industrially.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If aluminum phosphate
Aluminum salts of phosphates are classified under heading 2833 for specific metal phosphates.
If fertilizer grade with mineral additives
Phosphates mixed with mineral substances for fertilizer use fall under Chapter 31 per chapter notes.
If premixed in chemical preparations
If imported as part of a formulated mixture rather than pure compound, it shifts to heading 3824.
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Import Tips & Compliance
• Verify purity and chemical composition via lab analysis to confirm classification as polyphosphate under Chapter 28
• Include Safety Data Sheets (SDS) and Certificate of Analysis in documentation to avoid reclassification to Chapter 31
• Ensure proper labeling for hazardous materials if shipped in bulk to comply with DOT and EPA regulations
Related Products under HTS 2835.29.51.00
Tetrasodium Pyrophosphate
Tetrasodium pyrophosphate is an inorganic polyphosphate used as a buffering agent, emulsifier in foods, and dispersant in industrial cleaners. Classified under HTS 2835.29.51.00 as 'other' polyphosphates, it meets Chapter 28 definitions for chemically defined phosphorus compounds. Commonly supplied as white crystalline powder.
Disodium Phosphate Anhydrous
Disodium phosphate (Na2HPO4) is a sodium salt of phosphoric acid used in dairy processing, pharmaceuticals, and as a pH buffer. It qualifies under HTS 2835.29.51.00 as 'other' phosphates, being a chemically defined inorganic compound per Chapter 28 notes. Available in granular or powder form.
Trisodium Phosphate Dodecahydrate
Trisodium phosphate dodecahydrate (Na3PO4·12H2O) serves as a cleaning agent, degreaser, and pH regulator in industrial and dairy applications. Falls under HTS 2835.29.51.00 as other phosphates, chemically defined per Chapter 28. The hydrated crystalline form is standard for commercial use.
Potassium Phosphate Monobasic
Potassium dihydrogen phosphate (KH2PO4) is used in fertilizers, pharmaceuticals, and as a buffering agent in lab reagents. Classified in HTS 2835.29.51.00 as other phosphates, it's a chemically defined inorganic potassium salt. High purity grades exceed 99%.
Sodium Hexametaphosphate
Sodium hexametaphosphate (SHMP) is a polyphosphate sequestering agent used in water treatment, ceramics, and food processing. It fits HTS 2835.29.51.00 as other polyphosphates, chemically defined under Chapter 28 exclusions. Glassy or powdered forms are typical.
Diammonium Phosphate
Diammonium phosphate ((NH4)2HPO4) functions as a fire retardant, yeast nutrient in baking, and pH buffer. Under HTS 2835.29.51.00 as other phosphates, it's chemically defined per Chapter 28 for ammonium salts. White crystalline powder form.