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HSChapter 28
U.S. imports of phosphinates (hypophosphites) & phosphonates (HS 283510) totaled $1.6M in July 2026, traded with 10 countries.
Importers of Phosphinates (Hypophosphites) & Phosphonates 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 are specialty phosphorus compounds used as flame retardants, scale inhibitors in water treatment, and intermediates in pharmaceutical and agrochemical synthesis. China is the dominant US import source under this heading, and imports from China are subject to Section 301 tariffs, a significant cost consideration for formulators relying on Chinese supply. The heading resolves to a single tariff line, 2835100000, covering both phosphinates (hypophosphites) and phosphonates regardless of the specific metal cation or organic substituent.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
15 shipments/mo
Inorganic phosphonates and phosphinates (hypophosphites) are classified here under 2835100000. Organic phosphonate compounds, however, may be classified in Chapter 29 as organic phosphorus compounds depending on their chemical structure. The distinction between inorganic salts and organic derivatives is the key classification boundary, and a licensed customs broker should be consulted for complex molecules.
Because China is the leading supplier and Chinese-origin phosphonates are subject to Section 301 tariffs, many US importers have explored alternative sources such as Switzerland, Japan, and India. However, supply concentration and technical specifications often limit substitution options, making tariff engineering (e.g., first-sale valuation or bonded warehouse strategies) a common mitigation approach.
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HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2835100000 | Phosphinates (Hypophosphites) & Phosphonates | $1.6M | 34.96% | 99.01% | $567K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2835100000 | Phosphinates (Hypophosphites) & Phosphonates | $151K |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
ImportsExports
Imports
$1.6MYoY · Pro
Exports
$151KYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Imports · July 2026
origin
China and India together supply 95% of it.
customs district
destination
entry
rate provision · imports
1.0% enters free of duty; the effective duty rate is 34.96%.