Loading...
HSChapter 28
U.S. imports of phosphinates (hypophosphites) & phosphonates (HS 283510) totaled $1.6M in April 2026, traded with 10 countries.
Importers of Phosphinates (Hypophosphites) & Phosphonates 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 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.
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.
Monthly import values over time
Supplier Network
Get discovered by U.S. importers searching for HS 283510 — Phosphinates (Hypophosphites) & Phosphonates. Be the first supplier listed.
| Country | Imports | Exports | Balance |
|---|---|---|---|
| CHINA | $1.3M | -- | -$1.3M |
| SWITZERLAND | $120K | -- | -$120K |
| JAPAN | $120K | -- | -$120K |
| LIBYA | -- | $82K | +$82K |
| BRAZIL | -- | $69K | +$69K |
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 2835100000 | PHOSPHINATES (HYPOPHOSPHITES) & PHOSPHONATES | $1.6M | 33.89% | $542K |
PHOSPHINATES (HYPOPHOSPHITES) & PHOSPHONATES
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2835100000 | PHOSPHINATES (HYPOPHOSPHITES) & PHOSPHONATES | $234K |
PHOSPHINATES (HYPOPHOSPHITES) & PHOSPHONATES
51.0K kg
URANIUM ENRICHED IN U235 ETC. PLUTONIUM ETC.
HS 284420
NATURAL URANIUM & COMPOUNDS, ALLOYS & CERAMICS ETC
HS 284410
ANHYDROUS AMMONIA
HS 281410
ALLOYS, DISPERSIONS,ISOTOPES & COMPOUNDS NES
HS 284443
SILICON, UNDER 99.99% (BY WEIGHT) SILICON
HS 280469
PHOSPHORIC ACID AND POLYPHOSPHORIC ACIDS
HS 280920
| State | Imports | Exports | Balance |
|---|---|---|---|
| South Carolina | $581K | -- | -$581K |
| Tennessee | $520K | -- | -$520K |
| Georgia | $358K | -- | -$358K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| SAVANNAH, GA | $739K | -- | -$739K |
| CHARLESTON, SC | $719K | -- | -$719K |
| HOUSTON, TX | -- | $142K | +$142K |