Harmonized System
U.S. imports of Double Salts & Mixtures of Calcium & Ammonium Nitrate (HS 310260) totaled $2.3M in August 2026, imported from 17 countries.
Importers of Double Salts & Mixtures of Calcium & Ammonium Nitrate paid $4K in duties in August 2026, an average duty rate of 0.17% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Double Salts & Mixtures of Calcium & Ammonium Nitrate imports of $2.3M in August 2026 ran 67% below the year-to-date monthly average of $7.0M.
Last updated: August 2026 dataProducts combining calcium nitrate and ammonium nitrate as double salts or blended mixtures — distinct from the calcium carbonate-based CAN formulations of heading 310240 — are classified under 3102600000. Norway's Yara International is historically the dominant global producer of calcium ammonium nitrate double-salt grades, which explains Norway's leading position in US imports of this heading, with Lithuania and China also supplying the market. Like other ammonium nitrate-containing fertilizers, these products may be subject to DHS CFATS thresholds depending on their AN content, and trade professionals should verify current antidumping or countervailing duty orders for relevant origins.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
27 import shipments a month
Heading 310240 covers mixtures of ammonium nitrate with calcium carbonate (a non-nitrate calcium source), while heading 310260 covers double salts and mixtures where both the calcium and nitrogen components are in nitrate form — i.e., calcium nitrate combined with ammonium nitrate. The distinction requires a certificate of composition identifying the specific calcium compound present.
Norway is home to Yara International, one of the world's largest nitrogen fertilizer producers, which pioneered and continues to produce calcium ammonium nitrate double-salt grades at scale. This manufacturing concentration means a significant share of global supply originates from Norwegian facilities, making Norway a structurally dominant source for US importers.
Subheading 7 of 9 in heading 3102
Subheading 310260 · $2.3M of $177.1M
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ImportsExports
Imports
$2.3MYoY · free account
Exports
$889KYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $70.0M of Double Salts & Mixtures of Calcium & Ammonium Nitrate and exported $11.7M.
Through August 2026. Source: U.S. Census Bureau.
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 |
|---|---|---|---|---|---|
| 3102600000 | Double Salts & Mixtures Calcium & Ammonium Nitrate | $2.3M | 0.17% | 1.70% | $4K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3102600000 | Double Salts & Mixtures Calcium & Ammonium Nitrate | $889K |
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.
Imports · August 2026
origin
Norway and Lithuania together supply 95% of it. Czech Republic pays 10.0% duty; Norway 0.0%.
customs district
destination
entry
rate provision · imports
98.3% enters free of duty; duty collected equals 0.17% of imports for consumption.