U.S. imports of Trimethyl Phosphite (HS 292023) totaled $370K in August 2026, imported from 4 countries.
Importers of Trimethyl Phosphite paid $74K in duties in August 2026, an average duty rate of 19.87% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Trimethyl Phosphite imports of $370K in August 2026 ran 14% below the year-to-date monthly average of $432K.
Last updated: August 2026 dataTrimethyl phosphite (TMP) is a reactive organophosphorus reagent used primarily in the manufacture of pesticides, flame retardants, and specialty polymers. India and China together account for the dominant share of US import supply, with France and Japan rounding out the supplier base. Imports enter under a single tariff line (2920230000), and Chinese-origin material is subject to Section 301 tariff measures, making origin verification a routine compliance step for procurement teams.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
4 import shipments a month
Because India and China are the leading suppliers, and Chinese-origin trimethyl phosphite is subject to Section 301 tariffs, importers must confirm the country of origin with supporting documentation — including manufacturer certificates and, where applicable, substantial transformation analysis — to ensure correct duty assessment.
Trimethyl phosphite is consumed mainly as a chemical intermediate in agrochemical synthesis (particularly organophosphate pesticides), flame retardant production, and specialty polymer stabilizers. Demand tends to track agricultural chemical production cycles and regulatory approvals for new pesticide active ingredients.
Subheading 4 of 9 in heading 2920
Subheading 292023 · $370K of $36.5M
ImportsExports
Imports
$370KYoY · free account
Exports
$30KYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $6.0M of Trimethyl Phosphite and exported $498K.
Fewer than 6 of the last 12 months reported trade, or the latest month was under $500K; the trend chart is not shown for thin series.
Through August 2026. Source: U.S. Census Bureau.
Imports · August 2026
origin
India and China together supply 100% of it. China pays 41.2% duty; India 13.7%.
customs district
destination
entry
rate provision · imports
duty collected equals 19.87% of imports for consumption.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2920230000 | Trimethyl Phosphite | $370K | 19.87% | 100.00% | $74K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2920230000 | Trimethyl Phosphite | $30K |
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.
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