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SITCSection 5
U.S. imports of phosphinates (hypophosphites) and phosphonates (phosphites) (SITC 52361) totaled $1.6M in July 2026, traded with 10 countries.
Importers of Phosphinates (Hypophosphites) and Phosphonates (Phosphites) paid $567K in duties in July 2026 — an effective duty rate of 35% on $1.6M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 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.
15 shipments/mo
Basic heading 373 of 465 in section 5
Basic heading 52361 · $1.6M of $28.9B
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.
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Imports · July 2026
origin
China and India together supply 95% of it.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$1.6MYoY · Pro
Exports
$151KYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.