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HSChapter 29
U.S. imports of diethyl phosphite (HS 292022) totaled $288K in April 2026, traded with 3 countries.
Importers of Diethyl Phosphite paid $39K in duties in April 2026 — an effective duty rate of 14% on $288K in dutiable value, based on actual customs collections rather than the published tariff schedule. Diethyl Phosphite imports of $288K in April 2026 ran 162% above the year-to-date monthly average of $110K.
Last updated: April 2026 dataDiethyl phosphite (DEP) serves as a key building block in organophosphorus chemistry, with applications spanning pesticide synthesis, lubricant additives, and pharmaceutical intermediates. India is the leading US supplier, followed by China and Germany — a concentration in Asian sources that creates Section 301 exposure for Chinese-origin shipments. All US imports enter under tariff line 2920220000, and buyers should verify certificate-of-analysis specifications against contract purity requirements, as grade variations affect downstream reaction yields.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
The two compounds are classified at separate HS6 headings — dimethyl phosphite under 292021 and diethyl phosphite under 292022 — based on the alkyl group attached to the phosphorus ester. The distinction matters because they are distinct chemical entities with different CAS numbers, and misclassification can trigger penalties.
Commercial diethyl phosphite is traded in technical and high-purity pharmaceutical grades. Buyers should specify minimum purity thresholds (commonly 98–99%+) in purchase contracts, as lower-grade material may contain diethyl phosphonate impurities that affect synthesis performance and may require additional customs documentation for certain end uses.
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Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 2920220000 | DIETHYL PHOSPHITE | $288K | 13.70% | $39K |
DIETHYL PHOSPHITE
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2920220000 | DIETHYL PHOSPHITE | $6K |
DIETHYL PHOSPHITE
1.5K kg
NUCLEIC ACIDS & SALTS; OTHER HETEROCYCLIC CMP, NES
HS 293499
HETEROCYCLIC COMP W NITROGEN HETERO-ATM ONLY NESOI
HS 293399
POLYPEPTIDE PROTEIN& GLYCOPROTEIN HORMONES &DERIV
HS 293719
CMPDS CONT AN UNFUSED PYRIDINE RING ETC NESOI
HS 293339
COMP WITH PYRIMIDINE OR PIPERAZINE RING, NESOI
HS 293359
ANTIBIOTICS, NESOI
HS 294190
| State | Imports | Exports | Balance |
|---|---|---|---|
| Virginia | $211K | -- | -$211K |
| West Virginia | $77K | -- | -$77K |
| Texas | -- | $6K | +$6K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| NORFOLK-NEWPORT NEWS, VA | $288K | -- | -$288K |
| LAREDO, TX | -- | $6K | +$6K |
| CHICAGO, IL | -- | -- | -- |