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HSChapter 38
U.S. imports of antioxidizing preparations & compound stabilizers for rubber or plastics (HS 381239) totaled $37.4M in July 2026, traded with 27 countries.
Importers of Antioxidizing Preparations & Compound Stabilizers for Rubber or Plastics paid $4.4M in duties in July 2026 — an effective duty rate of 15% on $29.0M in dutiable value, based on actual customs collections rather than the published tariff schedule. Antioxidizing Preparations & Compound Stabilizers for Rubber or Plastics imports of $37.4M in July 2026 ran 27% above the year-to-date monthly average of $29.4M.
Last updated: July 2026 dataAromatic antioxidants and compound stabilizers for rubber and plastics are specialty chemical additives that prevent thermal and oxidative degradation during processing and end-use service life. The US tariff schedule breaks this heading into six distinct 10-digit lines, including mixtures of N,N'-diaryl-p-phenylenediamines (3812392000), master batches of poly[nitrilomethanetetraarylnitr] (3812393000), and bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate — a hindered-amine light stabilizer (HALS) — at 3812397000. Indonesia leads US import supply, followed by Mexico and Canada, making USMCA origin documentation a routine compliance consideration for North American sourced material. Importers should verify whether specific aromatic or modified plasticizer lines fall under Section 301 exposure depending on the country of origin.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
369 shipments/mo
Bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, a common HALS, has its own dedicated line at 3812397000. Other aromatic or modified compound stabilizers not specifically enumerated typically fall under the residual line 3812399000. Classification should be confirmed against the product's chemical identity and CBP binding ruling guidance.
Yes. Mixtures of N,N'-diaryl-p-phenylenediamines — widely used as antiozonants in rubber compounding — are specifically enumerated at 3812392000, distinct from the broader residual stabilizer lines. Correct classification requires confirming the chemical composition and mixture ratios against the tariff schedule language.
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Subheading 1 of 4 in heading 3812
Subheading 381239 · $37.4M of $48.6M
ImportsExports
Imports
$37.4MYoY · Pro
Exports
$28.1MYoY · Pro
12-mo low · imports
YoY · ProThrough July 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 | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 3812399000 | Antioxiding Prep & Compnd Stabilizers, Etc, NESOI | $25.3M | 13.21% | 84.27% | $3.3M |
| 3812396000 | Compnd Plastczrs,Plastc/Rubber,Arom/Mod,Nes | $10.7M | 8.23% | 59.27% | $881K |
| 3812397000 | Bis (1,2,2,6,6-Pentamethyl-4-Piperidinyl) Sebacate | $762K | 10.20% | 100.00% | $78K |
| 3812393000 | Master Batches of Poly[nitrilomethanetetraarylnitr | $426K | 8.61% | 86.06% | $37K |
| 3812392000 | Mixtures of N,N'-Diaryl-P-Phenylenediamines | $258K | 15.13% | 100.00% | $39K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3812390000 | Plstczrs for Rubber/Plas,Aromt Antiox,Oth Stablzr | $28.1M |
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 · July 2026
origin
Indonesia and Mexico together supply 44% of it.
customs district
destination
entry
rate provision · imports
22.2% enters free of duty; the effective duty rate is 11.69%.