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HSChapter 29
U.S. imports of diphenylamine and its derivatives; salts (HS 292144) totaled $945K in April 2026, traded with 7 countries.
Importers of Diphenylamine and Its Derivatives; Salts paid $142K in duties in April 2026 — an effective duty rate of 17% on $852K in dutiable value, based on actual customs collections rather than the published tariff schedule. Diphenylamine and Its Derivatives; Salts imports of $945K in April 2026 ran 14% above the year-to-date monthly average of $832K.
Last updated: April 2026 dataDiphenylamine (DPA) and its derivatives serve as antioxidants and stabilizers in rubber, lubricants, and propellants, with alkylated diphenylamine variants — such as the 4,4'-bis(dimethylbenzyl) compound enumerated in line 2921440500 — widely used as high-temperature antioxidants in industrial lubricants and turbine oils. Canada is the leading supplier to the US market. The US schedule separates a specifically named derivative (2921440500) from the broader category of diphenylamine and derivatives not covered by US Note 3 to Section VI (2921447000), making the note's scope a key classification reference.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
US Note 3 to Section VI identifies certain aromatic or modified aromatic compounds that are classified elsewhere in the schedule despite their chemical structure. Products falling within that note's scope are excluded from 2921447000 and must be classified under the note-directed heading. Importers should review the note text and, if needed, seek a CBP ruling to confirm whether a specific diphenylamine derivative is captured by or excluded from the note.
Alkylated diphenylamines are consumed primarily by lubricant additive blenders serving the automotive, aviation, and industrial machinery sectors. Demand is relatively steady year-round but can spike with new lubricant formulation launches or when petroleum-based antioxidant alternatives face supply disruptions.
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Monthly import values over time
| Country | Imports | Exports | Balance |
|---|---|---|---|
| CANADA | $92K | $2.2M | +$2.1M |
| INDIA | $572K | $441K | -$130K |
| ITALY | $171K | $611K | +$440K |
| KOREA, SOUTH | -- | $266K | +$266K |
| TAIWAN | -- | $185K | +$185K |
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 2921447000 | DIPHENYLAMINE AND DER (EXC PROD IN US NT 3 SEC6) | $739K | 16.80% | $124K |
| 2921440500 | 4,4' (A,A-DIMETHYLBENZYL)-DIPHENYLAMINE; ETC. | $205K | 15.41% | $17K |
DIPHENYLAMINE AND DER (EXC PROD IN US NT 3 SEC6)
4,4' (A,A-DIMETHYLBENZYL)-DIPHENYLAMINE; ETC.
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2921440000 | DIPHENYLAMINE AND ITS DERIVATIVES; SALTS THEREOF | $3.9M |
DIPHENYLAMINE AND ITS DERIVATIVES; SALTS THEREOF
2.0M kg
NUCLEIC ACIDS & SALTS; OTHER HETEROCYCLIC CMP, NES
HS 293499
HETEROCYCLIC COMP W NITROGEN HETERO-ATM ONLY NESOI
HS 293399
POLYPEPTIDE PROTEIN& GLYCOPROTEIN HORMONES &DERIV
HS 293719
CMPDS CONT AN UNFUSED PYRIDINE RING ETC NESOI
HS 293339
COMP WITH PYRIMIDINE OR PIPERAZINE RING, NESOI
HS 293359
ANTIBIOTICS, NESOI
HS 294190
| State | Imports | Exports | Balance |
|---|---|---|---|
| Pennsylvania | -- | $2.1M | +$2.1M |
| Louisiana | -- | $1.5M | +$1.5M |
| Ohio | $536K | $59K | -$477K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| PORT HURON, MI | -- | $2.1M | +$2.1M |
| NEW ORLEANS, LA | -- | $1.4M | +$1.4M |
| NORFOLK-NEWPORT NEWS, VA | $629K | -- | -$629K |