# HTS 2931: Other organo-inorganic compounds:

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Source: [2026 HTS Revision 21 (October 9, 2026)](https://hts.usitc.gov/search?query=2931). Additional duties by country of origin may apply; estimate a shipment's full duty with the tariff calculator: https://geopax.app/tariffs/calculator

## 2931: Other organo-inorganic compounds:

| Code | Description | General | Special | Column 2 | Units |
| --- | --- | --- | --- | --- | --- |
| 2931 | Other organo-inorganic compounds: |  |  |  |  |
| 2931.10.00.00 |   Tetramethyl lead and tetraethyl lead | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.20.00.00 |   Tributyltin compounds | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
|  |   Non-halogenated organo-phosphorous derivatives: |  |  |  |  |
| 2931.41.00.00 |     Dimethyl methylphosphonate | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.42.00.00 |     Dimethyl propylphosphonate | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.43.00.00 |     Diethyl ethylphosphonate | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.44.00.00 |     Methylphosphonic acid | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.45.00.00 |     Salt of methylphosphonic acid and (aminoiminomethyl)urea (1:1) | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.46.00.00 |     2,4,6-Tripropyl-1,3,5,2,4,6-trioxatriphosphinane 2,4,6-trioxide | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.47.00.00 |     (5-Ethyl-2-methyl-2-oxido-1,3,2-dioxaphosphinan-5-yl) methyl methyl methylphosphonate | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.48.00.00 |     3,9-Dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro [5.5] undecane 3,9-dioxide | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.49.00 |     Other | 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 | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | 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 | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.49.00.10 |       2-Amino-4-[hydroxy(methyl)phosphonoyl] butanoic acid (glufosinate) and its salts and esters | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.49.00.15 |       Butyl methylphosphinate | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.49.00.20 |       N-(Phosphonomethyl) glycine (glyphosate) and its salts and esters | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.49.00.25 |       Bis(1-methylpentyl) methylphosphonate | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
|  |       Other: | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% |  |
| 2931.49.00.55 |         Containing a phosphorus atom to which one methyl, ethyl, n-propyl or isopropyl group is bonded but no further carbon atoms | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.49.00.80 |         Other | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
|  |   Halogenated organo-phosphorous derivatives: |  |  |  |  |
| 2931.51.00.00 |     Methylphosphonic dichloride | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.52.00.00 |     Propylphosphonic dichloride | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.53.00.00 |     O-(3-chloropropyl) O-[4-nitro-3-(trifluoromethyl)phenyl] methylphosphonothionate | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.54.00.00 |     Trichlorfon (ISO) | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.59.00 |     Other | 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 | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.59.00.15 |       Alkyl (methyl, ethyl, n-propyl or isopropyl) phosphonyl difluorides | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.59.00.20 |       O-Isopropyl methylphosphonochloridate | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.59.00.25 |       O-Pinacolyl methylphosphonochloridate | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | 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 | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.59.00.35 |       Methyl- bis(diethylamino)methylene)phosphonamidofluoridate | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | 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 | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.59.00.80 |       Other | 3.7% | Free (A,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.90 |   Other: |  |  |  |  |
|  |     Aromatic: |  |  |  |  |
| 2931.90.05.00 |       Diphenyldichlorosilane; and phenyltrichlorosilane | Free |  | 15.4¢/kg + 68.5% | kg |
| 2931.90.10.00 |       4,4'-Diphenylbisphosphonous acid, di(2',2",4',4"-di-tert-butyl)phenyl ester | 6.5% | Free (A+, AU, BH, CL,CO,D, E, IL, JO, KR, MA, OM, P, PA, PE, S, SG) | 15.4¢/kg + 40% | kg |
| 2931.90.15.00 |       Sodium tetraphenylboron | 5.8% | Free (A+, AU, BH, CL, CO, D, E, IL, JO, KR, MA, OM, P, PA, PE, S, SG) | 15.4¢/kg + 40% | kg |
|  |       Other: |  |  |  |  |
| 2931.90.22.00 |         Drugs | 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% | kg |
| 2931.90.26.00 |         Pesticides | 6.5% | Free (A*,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 15.4¢/kg + 40% | kg |
|  |         Other: |  |  |  |  |
| 2931.90.30.00 |           Products described in additional U.S. note 3 to section VI | 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% | kg |
| 2931.90.60.00 |           Other | 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% | kg |
|  |     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 | Free |  | 25% | kg |
| 2931.90.90 |       Other | 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 compounds | 3.7% | Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
|  |         Organo-tin compounds: | 3.7% | Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% |  |
| 2931.90.90.21 |           Dibutyltin oxide | 3.7% | Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.90.90.25 |           Tetrabutyltin | 3.7% | Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.90.90.29 |           Other | 3.7% | Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.90.90.30 |         2-Chlorovinyldichloroarsine | 3.7% | Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.90.90.35 |         Bis(2-chlorovinyl)chloroarsine | 3.7% | Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.90.90.40 |         Tris(2-chlorovinyl)arsine | 3.7% | Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |
| 2931.90.90.52 |         Other | 3.7% | Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) | 25% | kg |