HTS heading 3812 · Chapter 38
HTS 3812: Prepared rubber accelerators
HTS heading 3812 covers prepared rubber accelerators; compound plasticizers for rubber or plastics, not elsewhere specified or included; antioxidizing preparations and other compound stabilizers for rubber or plastics. It has 15 tariff lines with a duty rate; the general (MFN) rates are 6.5% (7 lines), 5% (3 lines), Free (3 lines) and others.
Imports may also owe Chapter 99 tariffs (Section 232, 301 or 201) depending on origin and date, plus the Merchandise Processing Fee and, by sea, the Harbor Maintenance Fee.
Rates from the 2026 HTS Revision 22, effective October 30, 2026. Source: U.S. International Trade Commission.
Tariff lines and duty rates
| HTS code | Description | General | Special | Column 2 | Estimate |
|---|---|---|---|---|---|
| 3812.10 | Prepared rubber accelerators: | ||||
| 3812.10.10.00 | Containing any aromatic or modified aromatic rubber accelerator[kg] | 6.5% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 3.7¢/kg + 60% | Estimate → |
| 3812.10.50.00 | Other[kg] | 5% | Free (A+,AU,BH,CL,CO,D, E,IL, JO,KR,MA,OM,P, PA,PE,S,SG) | 25% | Estimate → |
| 3812.20 | Compound plasticizers for rubber or plastics: | ||||
| 3812.20.10.00 | Containing any aromatic or modified aromatic plasticizer[kg] | 6.5% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 15.4¢/kg + 57% | Estimate → |
| 3812.20.50.00 | Other[kg] | 5% | Free (A+,AU,BH,CL,CO,D, E,IL, JO,KR,MA,OM,P, PA,PE,S,SG) | 25% | Estimate → |
| Anti-oxidizing preparations and other compound stabilizers for rubber or plastics: | |||||
| 3812.31.00.00 | Mixtures of oligomers of 2,2,4-trimethyl-1,2-dihydroquinoline (TMQ)[kg] | 6.5% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 3.7¢/kg + 60% | Estimate → |
| 3812.39 | Other: | ||||
| Containing any aromatic or modified aromatic antioxidant or other stabilizer: | |||||
| 3812.39.20.00 | Mixtures of N,N'-diaryl-p-phenylenediamines[kg] | 6.5% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 3.7¢/kg + 60% | Estimate → |
| 3812.39.30.00 | Master batches of poly[nitrilomethanetetraaryl- nitrilo[2,4,6- tris(1-methylethyl)-1,3- phenylene]]-2,6-bis(1-methylethyl)phenyl]-ω- [[[[2,6-bis(1-methylethyl)phenyl]amino]- methylene]amino]carbodiimide or 2,4-diisocyanate-1,3,5-tris(1-methylethyl)- benzene homopolymer with polyethylene, polyethylene terephthalate, or thermoplastic polyurethanes;Master batches of 3-(2H-benzotriazol-2-yl)-5- (tert-butyl)-4-hydroxybenzenepropanoic acid, C7-C9 branched or linear alkyl esters; andMaster batches of α-[3-[3-(2H-benzotriazol-2- yl)-5-(1,1-dimethylethyl)-4-hydroxyphenyl]-1- oxopropyl-ω-[3-[3-(2H-benzotriazol-2-yl)-5- (1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxo- propyl] poly(oxyethylene)[kg] | Free | 3.7¢/kg + 60% | Estimate → | |
| 3812.39.60.00 | Other[kg] | 6.5% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 3.7¢/kg + 60% | Estimate → |
| Other: | |||||
| 3812.39.70.00 | Bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate[kg] | Free | 25% | Estimate → | |
| 3812.39.90.00 | Other[kg] | 5% | Free (A+,AU,BH,CL,CO,D, E,IL, JO,KR,MA,OM,P, PA,PE,S,SG) | 25% | Estimate → |
| 3813.00 | Preparations and charges for fire extinguishers; charged fire-extinguishing grenades: | ||||
| 3813.00.10.00 | Consisting wholly of inorganic substances[kg] | Free | 25% | Estimate → | |
| 3813.00.50.00 | Other[kg] | 3.7% | Free (A*,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 20% | Estimate → |
| 3814.00 | Organic composite solvents and thinners, not elsewhere specified or included; prepared paint or varnish removers: | ||||
| 3814.00.10.00 | Containing 5 percent or more but not more than 25 percent by weight of one or more aromatic or modified aromatic substances[kg] | 6.5% | Free (A+,AU,BH,CL,CO,D, E,IL, JO,KR,MA,OM,P, PA,PE,S,SG) | 3.7¢/kg + 60% | Estimate → |
| 3814.00.20.00 | Containing more than 25 percent by weight of one or more aromatic or modified aromatic substances[kg] | 6.5% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 15.4¢/kg + 43.5% | Estimate → |
| 3814.00.50 | Other | 6% | Free (A+,AU,BH,CL,CO,D, E,IL, JO,KR,MA,OM,P, PA,PE,S,SG) | 25% | |
| 3814.00.50.10 | Containing methyl chloroform (1,1,1-trichloro- ethane) or carbon tetrachloride[kg] | Estimate → | |||
| 3814.00.50.90 | Other[kg] | Estimate → |
17 lines shown. Statistical suffixes (the last two digits) inherit the rate of the 8-digit subheading above them.
Example: base duty and fees on $10000
For HTS 3812.10.10.00 at the general rate of 6.5%, shipped by ocean, before any Chapter 99 tariffs:
| Base duty (6.5%) | $650.00 |
| Merchandise Processing Fee (0.3464%, min $34.58) | $34.64 |
| Harbor Maintenance Fee (0.125%) | $12.50 |
| Duty and fees | $697.14 |
Origin-specific tariffs can multiply this. Run this example from China or from Mexico to see every line.
Special program codes in this heading
- A, A*, A+
- Generalized System of Preferences (GSP)
- AU
- U.S.–Australia FTA
- BH
- U.S.–Bahrain FTA
- CL
- U.S.–Chile FTA
- CO
- U.S.–Colombia Trade Promotion Agreement
- D
- African Growth and Opportunity Act (AGOA)
- E, E*
- Caribbean Basin Economic Recovery Act
- IL
- U.S.–Israel FTA
- JO
- U.S.–Jordan FTA
- K
- Agreement on Trade in Pharmaceutical Products
- KR
- U.S.–Korea FTA (KORUS)
- MA
- U.S.–Morocco FTA
- OM
- U.S.–Oman FTA
- P, P+
- CAFTA-DR
- PA
- U.S.–Panama Trade Promotion Agreement
- PE
- U.S.–Peru Trade Promotion Agreement
- S, S+
- USMCA (United States–Mexico–Canada Agreement)
- SG
- U.S.–Singapore FTA
A special rate applies only when the goods qualify under that program's rules of origin and the claim is made at entry.
Frequently asked questions
What is the duty rate for HTS 3812?
Heading 3812 has 15 rate lines. The general (MFN) duty rates are 6.5% (7 lines), 5% (3 lines), Free (3 lines), 3.7% (1 line). Products of free trade agreement partners may enter at the special rate, and Column 2 rates apply to countries without normal trade relations. Chapter 99 tariffs can be added on top: calculate the full amount.
Do Section 301, 232 or 201 tariffs apply to HTS 3812?
It depends on the 8- or 10-digit subheading, the country of origin, the entry date and, for Section 232, the metal content. These additional duties are listed in Chapter 99 of the HTS. The free duty calculator checks each program for a given code, origin and date and shows which apply and why.
What fees are added to an import under HTS 3812?
Formal entries pay the Merchandise Processing Fee of 0.3464% of value (minimum $34.58, maximum $670.86 in FY2027). Ocean shipments also pay the Harbor Maintenance Fee of 0.125% of value. See the import duty calculator for how they combine.