Standard International Trade Classification
U.S. imports of Diphosphorus Pentoxide, Phosphoric Acid & Polyphosphoric Acids (SITC 52234) totaled $27.2M in August 2026, imported from 23 countries.
Importers of Diphosphorus Pentoxide, Phosphoric Acid & Polyphosphoric Acids paid $1.7M in duties in August 2026, an average duty rate of 6.31% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Diphosphorus Pentoxide, Phosphoric Acid & Polyphosphoric Acids imports of $27.2M in August 2026 ran 17% below the year-to-date monthly average of $33.0M.
Last updated: August 2026 dataPhosphoric acid — produced from diphosphorus pentoxide (P₂O₅) reacted with water — is a high-volume commodity serving the fertilizer, food-grade acidulant, and metal treatment industries, with polyphosphoric acids used in specialty applications such as asphalt modification and catalyst production. Food-grade phosphoric acid (used in beverages and food processing) is subject to FDA oversight and must meet purity specifications distinct from technical-grade material, making grade declaration a critical element of the import entry. Diphosphorus pentoxide itself is a powerful desiccant and dehydrating agent used in organic synthesis. EPA TSCA certification applies to technical-grade imports of all substances in this group.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
117 import shipments a month
Food-grade phosphoric acid must meet purity thresholds established by the Food Chemicals Codex (FCC) and is subject to FDA oversight as a food additive. Technical-grade material intended for fertilizer or industrial use does not require FDA review but must still carry EPA TSCA certification. Declaring the correct grade on entry documents is essential to avoid admissibility issues.
Beyond fertilizer applications, polyphosphoric acids are used as catalysts in petrochemical alkylation, as modifiers in polymer-modified bitumen for road construction, and as intermediates in specialty chemical synthesis. These niche end uses often involve smaller import volumes with tighter purity and viscosity specifications than commodity phosphoric acid.
Basic heading 138 of 465 in section 5
Basic heading 52234 · $27.2M of $27.5B
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Imports · August 2026
origin
Mexico and Belgium together supply 62% of it. Morocco pays 12.5% duty; Mexico 0.0%.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$27.2MYoY · free account
Exports
$30.3MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $350.5M of Diphosphorus Pentoxide, Phosphoric Acid & Polyphosphoric Acids and exported $404.7M.
Through August 2026. Source: U.S. Census Bureau.