Sodium Triphosphate (Sodium Tripolyphosphate)

Sodium tripolyphosphate (STPP) is a high-volume industrial and food-processing chemical best known for its role as a moisture-retention agent in seafood and meat processing, a builder in detergent formulations, and a dispersant in ceramics and paper manufacturing. All US imports enter under a single tariff line (2835310000), and food-grade STPP used in seafood processing is subject to FDA oversight at entry. Canada leads US supply under this heading, with Belgium and China as the next most significant sources. Importers sourcing from China should monitor Section 301 trade-remedy exposure, which can affect landed cost calculations.