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 — most notably as a component of propylphosphonic anhydride (T3P®) 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 — verify before relying on it.
The two compounds are separately enumerated at the HS6 level — 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.
Imports
Imports
—YoY · free account
Low of 2 reported months · imports
Low · free accountFewer 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 December 2025 · imports 2 of 12 months reported. Source: U.S. Census Bureau.
Subheading 15 of 17 in heading 2931
Trade Directory
List your company under HS 293152 — Propylphosphonic Dichloride, so the companies trading it can find you. Be the first supplier listed.
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 |
|---|---|---|---|---|---|
| 2931520000 | Propylphosphonic Dichloride | $23K | 3.70% | 100.00% | $859 |
Imports · December 2025
origin
customs district
None recorded for this period.
destination
None recorded for this period.
entry
None recorded for this period.
rate provision · imports
None recorded for this period.