Chapter 29: Organic chemicals
HTS heading 2931: Other organo-inorganic compounds
51 numbered lines under heading 2931, including 46 10-digit statistical lines. The first six digits are the international HS subheading; the general column is the normal US duty rate.
| HTS code | Description | Unit | General | Special | Column 2 |
|---|---|---|---|---|---|
| 2931 | Other organo-inorganic compounds: | ||||
| 2931.10.00.00 | Tetramethyl lead and tetraethyl leadNote: See 9903.90.08. | kg | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 25% |
| 2931.20.00.00 | Tributyltin compounds | kg | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 25% |
| Non-halogenated organo-phosphorous derivatives: | |||||
| 2931.41.00.00 | Dimethyl methylphosphonate | kg | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% |
| 2931.42.00.00 | Dimethyl propylphosphonate | kg | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% |
| 2931.43.00.00 | Diethyl ethylphosphonate | kg | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% |
| 2931.44.00.00 | Methylphosphonic acidNote: See 9903.90.08. | kg | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% |
| 2931.45.00.00 | Salt of methylphosphonic acid and (aminoiminomethyl)urea (1:1) | kg | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% |
| 2931.46.00.00 | 2,4,6-Tripropyl-1,3,5,2,4,6-trioxatriphosphinane 2,4,6-trioxide | kg | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% |
| 2931.47.00.00 | (5-Ethyl-2-methyl-2-oxido-1,3,2-dioxaphosphinan-5-yl) methyl methyl methylphosphonate | kg | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% |
| 2931.48.00.00 | 3,9-Dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro [5.5] undecane 3,9-dioxideNote: See 9903.90.08. | kg | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% |
| 2931.49.00 | OtherNote: See 9903.90.08. | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | |
| 2931.49.00.05 | O-Alkyl (≤C10, including cycloalkyl) N,N-dialkyl (methyl, ethyl, n-propyl or isopropyl) phosphoramidocyanidates | kg | |||
| 2931.49.00.08 | [O-2-(Dialkyl (methyl, ethyl, n-propyl or isopropyl) amino)ethyl] hydrogen alkyl (methyl, ethyl, n-propyl or isopropyl) phosphonites and their O-alkyl (≤C10, including cycloalkyl) esters; alkylated or protonated salts thereof | kg | |||
| 2931.49.00.10 | 2-Amino-4-[hydroxy(methyl)phosphonoyl] butanoic acid (glufosinate) and its salts and esters | kg | |||
| 2931.49.00.15 | Butyl methylphosphinate | kg | |||
| 2931.49.00.20 | N-(Phosphonomethyl) glycine (glyphosate) and its salts and esters | kg | |||
| 2931.49.00.25 | Bis(1-methylpentyl) methylphosphonate | kg | |||
| Other: | |||||
| 2931.49.00.55 | Containing a phosphorus atom to which one methyl, ethyl, n-propyl or isopropyl group is bonded but no further carbon atoms | kg | |||
| 2931.49.00.80 | Other | kg | |||
| Halogenated organo-phosphorous derivatives: | |||||
| 2931.51.00.00 | Methylphosphonic dichlorideNote: See 9903.90.08. | kg | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% |
| 2931.52.00.00 | Propylphosphonic dichlorideNote: See 9903.90.08. | kg | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% |
| 2931.53.00.00 | O-(3-chloropropyl) O-[4-nitro-3-(trifluoromethyl)phenyl] methylphosphonothionateNote: See 9903.90.08. | kg | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% |
| 2931.54.00.00 | Trichlorfon (ISO)Note: See 9903.90.08. | kg | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% |
| 2931.59.00 | OtherNote: See 9903.90.08. | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | |
| 2931.59.00.10 | O-Alkyl (≤ C10, including cycloalkyl) alkyl (methyl, ethyl,n- propyl or isopropyl) phosphonofluoridates | kg | |||
| 2931.59.00.15 | Alkyl (methyl, ethyl, n-propyl or isopropyl) phosphonyl difluorides | kg | |||
| 2931.59.00.20 | O-Isopropyl methylphosphonochloridate | kg | |||
| 2931.59.00.25 | O-Pinacolyl methylphosphonochloridate | kg | |||
| 2931.59.00.30 | P-Alkyl (≤ C10, incl. cycloalkyl) N-(1-(dialkyl (≤ C10, incl. cycloalkyl) amino))alkylidene (H or ≤C10, incl. cycloalkyl) phosphonamidic fluorides and corresponding alkylated or protonated salts | kg | |||
| 2931.59.00.35 | Methyl- bis(diethylamino)methylene)phosphonamidofluoridate | kg | |||
| 2931.59.00.60 | Containing a phosphorus atom to which one methyl, ethyl, n-propyl or isopropyl group is bonded but no further carbon atoms | kg | |||
| 2931.59.00.80 | Other | kg | |||
| 2931.90 | Other: | ||||
| Aromatic: | |||||
| 2931.90.05.00 | Diphenyldichlorosilane; and phenyltrichlorosilane | kg | Free | 15.4¢/kg + 68.5% | |
| 2931.90.10.00 | 4,4'-Diphenylbisphosphonous acid, di(2',2",4',4"-di-tert-butyl)phenyl ester | kg | 6.5% | Free (A+, AU, BH, CL,CO,D, E, IL, JO, KR, MA, OM, P, PA, PE, S, SG) | 15.4¢/kg + 40% |
| 2931.90.15.00 | Sodium tetraphenylboron | kg | 5.8% | Free (A+, AU, BH, CL, CO, D, E, IL, JO, KR, MA, OM, P, PA, PE, S, SG) | 15.4¢/kg + 40% |
| Other: | |||||
| 2931.90.22.00 | Drugs | kg | 6.5% | Free (A+,AU,BH,CL,CO,D, E,IL,JO,K, KR,MA,OM,P, PA,PE,S,SG) | 15.4¢/kg + 67.5% |
| 2931.90.26.00 | Pesticides | kg | 6.5% | Free (A*,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 15.4¢/kg + 40% |
| Other: | |||||
| 2931.90.30.00 | Products described in additional U.S. note 3 to section VI | kg | 6.5% | Free (A+,AU,BH,CL,CO,D, E,IL,JO,K, KR,MA,OM,P, PA,PE,S,SG) | 15.4¢/kg + 68.5% |
| 2931.90.60.00 | Other | kg | 6.5% | Free (A+,AU,BH,CL,CO,D, E,IL,JO,K, KR,MA,OM,P, PA,PE,S,SG) | 15.4¢/kg + 68.5% |
| Other: | |||||
| 2931.90.70.00 | N,N'-Bis(trimethylsilyl) urea; 3-(Hydroxymethylphosphinyl)-1-propanoic acid, 2-hydroxyethyl ester; and 2-Phosphonobutane-1,2,4-tricarboxylic acid and its salts | kg | Free | 25% | |
| 2931.90.90 | OtherNote: Pursuant to U.S. note 20(g) to subchapter III, chapter 99, heading 9903.88.04 covers certain goods of this rate line, as indicated by the footnote; please note that statistical reporting descriptions without a footnote are not covered by that heading. See 9903.90.08. | 3.7% | Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | |
| 2931.90.90.10 | Organo-silicon compoundsNote: Pursuant to U.S. note 20(g) to subchapter III, chapter 99, heading 9903.88.04 covers certain goods of this rate line, as indicated by the footnote; please note that statistical reporting descriptions without a footnote are not covered by that heading. | kg | |||
| Organo-tin compounds: | |||||
| 2931.90.90.21 | Dibutyltin oxideNote: Pursuant to U.S. note 20(g) to subchapter III, chapter 99, heading 9903.88.04 covers certain goods of this rate line, as indicated by the footnote; please note that statistical reporting descriptions without a footnote are not covered by that heading. | kg | |||
| 2931.90.90.25 | TetrabutyltinNote: Pursuant to U.S. note 20(g) to subchapter III, chapter 99, heading 9903.88.04 covers certain goods of this rate line, as indicated by the footnote; please note that statistical reporting descriptions without a footnote are not covered by that heading. | kg | |||
| 2931.90.90.29 | OtherNote: Pursuant to U.S. note 20(g) to subchapter III, chapter 99, heading 9903.88.04 covers certain goods of this rate line, as indicated by the footnote; please note that statistical reporting descriptions without a footnote are not covered by that heading. | kg | |||
| 2931.90.90.30 | 2-Chlorovinyldichloroarsine | kg | |||
| 2931.90.90.35 | Bis(2-chlorovinyl)chloroarsine | kg | |||
| 2931.90.90.40 | Tris(2-chlorovinyl)arsine | kg | |||
| 2931.90.90.52 | Other | kg |
Statistical (10-digit) lines without a rate use the rate of the 8-digit line above them. Additional duties such as Section 301 and Section 232 may apply; check them with the tariff checker.
Free tools
Free customs and shipping tools
HTS Code Lookup
Search the full US Harmonized Tariff Schedule by product or code, with duty rates.
De Minimis & Tariff Checker
US de minimis status and the Section 301/232 tariffs that may apply to an import.
Landed Cost & Duty Calculator
Estimate import duties, taxes and fees so you can price DDP.
Commercial Invoice Generator
Make a customs-ready commercial invoice with HS codes, plus CN 22/CN 23-style declarations.
Want us to find the money leaking out of your shipping? Get a free profit-leak audit.
Request a free auditSource: Harmonized Tariff Schedule of the United States, 2026 HTS Revision 20 (effective 2026-09-28), U.S. International Trade Commission (hts.usitc.gov), imported 2026-10-07. Reference only; not legal or customs advice or a binding classification. Additional duties under Chapter 99 may apply. ShipWave is not affiliated with the USITC or U.S. Customs and Border Protection.