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HSChapter 31
U.S. imports of double salts & mixtures of calcium & ammonium nitrate (HS 310260) totaled $8.1M in April 2026, traded with 14 countries.
Importers of Double Salts & Mixtures of Calcium & Ammonium Nitrate paid $15K in duties in April 2026 — an effective duty rate of 20% on $77K in dutiable value, based on actual customs collections rather than the published tariff schedule. Double Salts & Mixtures of Calcium & Ammonium Nitrate imports of $8.1M in April 2026 ran 25% above the year-to-date monthly average of $6.5M.
Last updated: April 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.
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.
Monthly import values over time
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HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 3102600000 | DOUBLE SALTS & MIXTURES CALCIUM & AMMONIUM NITRATE | $8.1M | 20.01% | $15K |
DOUBLE SALTS & MIXTURES CALCIUM & AMMONIUM NITRATE
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3102600000 | DOUBLE SALTS & MIXTURES CALCIUM & AMMONIUM NITRATE | $952K |
DOUBLE SALTS & MIXTURES CALCIUM & AMMONIUM NITRATE
4.5K t
| State | Imports | Exports | Balance |
|---|---|---|---|
| California | $5.0M | $242K | -$4.8M |
| Ohio | $1.4M | $352K | -$1.1M |
| Florida | $1.2M | $119K | -$1.1M |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| STOCKTON, CA | $4.2M | -- | -$4.2M |
| TOLEDO-SANDUSKY, OH | $1.4M | -- | -$1.4M |
| SAVANNAH, GA | $1.1M | $61K | -$1.1M |