Sodium Tripolyphosphate for Water Treatment from Canada
STPP for boiler water treatment sequesters scale-forming ions to prevent corrosion. It is chemically defined sodium triphosphate under HTS 2835.31.00.00 in polyphosphates subheading.
Duty Rate — Canada → United States
11.4%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
Import Tips
• EPA registration under FIFRA if sold as pesticide/anti-fouling; otherwise TSCA
• Specify dosage rates in technical data sheet