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SITCSection 5
U.S. imports of polyphosphates, n.e.s. (SITC 52365) totaled $9.1M in April 2026, traded with 17 countries.
Importers of Polyphosphates, N.E.S. paid $1.1M in duties in April 2026 — an effective duty rate of 18% on $6.1M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataPolyphosphates not elsewhere specified under SITC 52365 cover condensed phosphate chains — such as hexametaphosphate, tetraphosphate, and longer-chain polyphosphates — that are not captured by the sodium tripolyphosphate heading. Sodium hexametaphosphate (SHMP) is the most commercially significant compound in this residual group, used as a sequestrant in water treatment, a dispersant in drilling fluids, and a food-grade additive in dairy and beverage processing. As with other condensed phosphates, food-contact grades may attract FDA scrutiny, and importers should document the degree of polymerization and intended application.
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Sodium tripolyphosphate (STPP) is a specific trimer with a defined chain length and has its own SITC heading (52364). Sodium hexametaphosphate and other longer-chain or cyclic polyphosphates fall into the NES residual heading (52365). The degree of polymerization — confirmed by a certificate of analysis — is the key document for supporting the correct classification.
Water treatment and municipal utilities use polyphosphates for corrosion inhibition and scale control in distribution systems. Oil and gas drilling operations use them as dispersants in drilling muds. Food and beverage manufacturers use food-grade polyphosphates as sequestrants and emulsifying salts in processed cheese, dairy, and canned seafood. Each end-use sector may have different purity and regulatory requirements.
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Monthly import values over time