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SITCSection 5
U.S. imports of phosphinates (hypophosphites) and phosphonates (phosphites) (SITC 52361) totaled $1.6M in April 2026, traded with 10 countries.
Importers of Phosphinates (Hypophosphites) and Phosphonates (Phosphites) paid $542K in duties in April 2026 — an effective duty rate of 34% on $1.6M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataPhosphinates and phosphonates — the lower oxidation-state relatives of phosphates — are specialty inorganic chemicals used as reducing agents, antioxidants in polymer stabilization, and intermediates in agrochemical and pharmaceutical synthesis. The distinction between hypophosphites (phosphinates) and phosphites (phosphonates) is chemically precise and directly determines the correct tariff line, so laboratory certification of oxidation state is a practical necessity for customs documentation. Supply chains for these compounds are concentrated in Asia, and importers should monitor whether specific products or origins are subject to Section 301 measures.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Hypophosphites (phosphinates, P in +1 oxidation state) and phosphites (phosphonates, P in +3 oxidation state) are chemically and commercially distinct from phosphates (P in +5 state). Each maps to a different tariff provision, so a certificate of analysis confirming the phosphorus oxidation state is essential to avoid misclassification and potential penalties.
Sodium hypophosphite is widely used in electroless nickel plating and as a reducing agent in chemical synthesis. Phosphonates serve as scale and corrosion inhibitors in water treatment, as flame retardants in polymers, and as building blocks for herbicides such as glyphosate. The end-use sector should be documented to support correct classification and any applicable end-use certificate requirements.
Monthly import values over time
| Country | Imports | Exports | Balance |
|---|---|---|---|
| CHINA | $1.3M | -- | -$1.3M |
| SWITZERLAND | $120K | -- | -$120K |
| JAPAN | $120K | -- | -$120K |
| LIBYA | -- | $82K | +$82K |
| BRAZIL | -- | $69K | +$69K |
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