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HSChapter 29
Propylphosphonic dichloride, classified under a single tariff line (2931520000), is a reactive organophosphorous acid chloride used as a synthetic intermediate in pharmaceutical and specialty chemical manufacturing ā most notably as a component of propylphosphonic anhydride (T3PĀ®) reagent systems. China is the sole recorded US supplier, and imports are subject to Section 301 tariffs, a cost factor that pharmaceutical and fine-chemical manufacturers must build into procurement planning. Its chemical reactivity requires careful handling documentation at the port of entry.
AI-written summary of the official U.S. Census Bureau trade figures on this page ā verify before relying on it.
The two compounds are separately enumerated at the HS6 level ā propylphosphonic dichloride at 293152 (HTS 2931520000) and methylphosphonic dichloride at 293151 (HTS 2931510000). The distinction turns on the alkyl chain length (propyl vs. methyl), and misclassification between them can affect applicable duty rates and trade-remedy exposure.
Propylphosphonic dichloride is not itself a CWC Schedule 1 or 2 chemical in the same way as methylphosphonic dichloride, but importers should independently verify current BIS and State Department schedules, as CWC annexes are periodically updated and related phosphonyl chlorides can attract scrutiny based on structural similarity.
Monthly import values over time
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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 |
|---|---|---|---|---|---|
| 2931520000 | PROPYLPHOSPHONIC DICHLORIDE | $23K | 3.70% | 100.00% | $859 |
NUCLEIC ACIDS & SALTS; OTHER HETEROCYCLIC CMP, NES
HS 293499
POLYPEPTIDE PROTEIN& GLYCOPROTEIN HORMONES &DERIV
HS 293719
CMPDS CONT AN UNFUSED PYRIDINE RING ETC NESOI
HS 293339
BENZENE
HS 290220
HETEROCYCLIC COMP W NITROGEN HETERO-ATM ONLY NESOI
HS 293399
HETEROCYCLIC COMP WITH UNFUSED PYRAZOLE RING NESOI
HS 293319
No geographic breakdown available
U.S. trade for this product is not broken down by state or port in the latest Census Bureau release.