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HSChapter 28
U.S. imports of diphosphorus pentaoxide (phosphorus pentoxide) (HS 280910) totaled $649K in July 2026, traded with 3 countries.
Importers of Diphosphorus Pentaoxide (Phosphorus Pentoxide) paid $78K in duties in July 2026 — an effective duty rate of 14% on $579K in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 2026 dataDiphosphorus pentaoxide (P₂O₅), also known as phosphorus pentoxide or phosphoric anhydride, is a powerful desiccant and dehydrating agent used in specialty chemical synthesis, optical fiber manufacturing, and semiconductor processing. India and China are the leading suppliers to the US market, with France representing a European source for higher-purity grades. Classified under a single line (2809100000), the product's extreme hygroscopicity demands specialized moisture-proof packaging and handling protocols that importers must verify comply with DOT hazardous-materials requirements.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
9 shipments/mo
Diphosphorus pentaoxide (2809100000) is the anhydrous oxide form of phosphorus, while phosphoric acid and polyphosphoric acids are classified under the adjacent heading 280920. The distinction matters because P₂O₅ is the dehydrated precursor — it reacts violently with water to form phosphoric acid — and the two products serve different industrial functions and carry separate tariff treatment.
Phosphorus pentoxide is classified as a DOT hazardous material (corrosive solid, water-reactive) and must be shipped in hermetically sealed, moisture-proof containers meeting UN specification standards. Shipping documents must include proper hazmat declarations, and importers should confirm that foreign packaging certifications are accepted under US DOT regulations before shipment.
Subheading 2 of 2 in heading 2809
Subheading 280910 · $649K of $36.0M
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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 |
|---|---|---|---|---|---|
| 2809100000 | Diphosphorus Pentaoxide | $649K | 12.06% | 89.22% | $78K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2809100000 | Diphosphorus Pentaoxide | $126K |
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.
ImportsExports
Imports
$649KYoY · Pro
Exports
$126KYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Imports · July 2026
origin
India and China together supply 90% of it.
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destination
entry
rate provision · imports
10.8% enters free of duty; the effective duty rate is 12.06%.