Heading 2931: Other organo-inorganic compounds
Every line of heading 2931 in the U.S. Harmonized Tariff Schedule, with its general (column 1) duty rate. Open a code for the landed cost calculator, trade agreement rates and email alerts if the rate changes.
Other organo-inorganic compounds
Chapter 29: Organic chemicals. Schedule checked on November 8, 2026.
Not always the total: additional chapter 99 duties (such as Section 232 or Section 301), antidumping or countervailing duties may apply depending on the country of origin. See recent chapter 99 changes →
Tariff lines
| HTS code | Official description | General rate |
|---|---|---|
| 2931.10.00.00 | Tetramethyl lead and tetraethyl lead | 3.7% |
| 2931.20.00.00 | Tributyltin compounds | 3.7% |
| 2931.41.00.00 | Dimethyl methylphosphonate | 3.7% |
| 2931.42.00.00 | Dimethyl propylphosphonate | 3.7% |
| 2931.43.00.00 | Diethyl ethylphosphonate | 3.7% |
| 2931.44.00.00 | Methylphosphonic acid | 3.7% |
| 2931.45.00.00 | Salt of methylphosphonic acid and (aminoiminomethyl)urea (1:1) | 3.7% |
| 2931.46.00.00 | 2,4,6-Tripropyl-1,3,5,2,4,6-trioxatriphosphinane 2,4,6-trioxide | 3.7% |
| 2931.47.00.00 | (5-Ethyl-2-methyl-2-oxido-1,3,2-dioxaphosphinan-5-yl) methyl methyl methylphosphonate | 3.7% |
| 2931.48.00.00 | 3,9-Dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro [5.5] undecane 3,9-dioxide | 3.7% |
| 2931.49.00 | Other | 3.7% |
| 2931.49.00.05 | O-Alkyl (≤C10, including cycloalkyl) N,N-dialkyl (methyl, ethyl, n-propyl or isopropyl) phosphoramidocyanidates | |
| 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 | |
| 2931.49.00.10 | 2-Amino-4-[hydroxy(methyl)phosphonoyl] butanoic acid (glufosinate) and its salts and esters | |
| 2931.49.00.15 | Butyl methylphosphinate | |
| 2931.49.00.20 | N-(Phosphonomethyl) glycine (glyphosate) and its salts and esters | |
| 2931.49.00.25 | Bis(1-methylpentyl) methylphosphonate | |
| 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 | |
| 2931.49.00.80 | Other | |
| 2931.51.00.00 | Methylphosphonic dichloride | 3.7% |
| 2931.52.00.00 | Propylphosphonic dichloride | 3.7% |
| 2931.53.00.00 | O-(3-chloropropyl) O-[4-nitro-3-(trifluoromethyl)phenyl] methylphosphonothionate | 3.7% |
| 2931.54.00.00 | Trichlorfon (ISO) | 3.7% |
| 2931.59.00 | Other | 3.7% |
| 2931.59.00.10 | O-Alkyl (≤ C10, including cycloalkyl) alkyl (methyl, ethyl,n- propyl or isopropyl) phosphonofluoridates | |
| 2931.59.00.15 | Alkyl (methyl, ethyl, n-propyl or isopropyl) phosphonyl difluorides | |
| 2931.59.00.20 | O-Isopropyl methylphosphonochloridate | |
| 2931.59.00.25 | O-Pinacolyl methylphosphonochloridate | |
| 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 | |
| 2931.59.00.35 | Methyl- bis(diethylamino)methylene)phosphonamidofluoridate | |
| 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 | |
| 2931.59.00.80 | Other | |
| 2931.90 | Other: | |
| 2931.90.05.00 | Diphenyldichlorosilane; and phenyltrichlorosilane | Free |
| 2931.90.10.00 | 4,4'-Diphenylbisphosphonous acid, di(2',2",4',4"-di-tert-butyl)phenyl ester | 6.5% |
| 2931.90.15.00 | Sodium tetraphenylboron | 5.8% |
| 2931.90.22.00 | Drugs | 6.5% |
| 2931.90.26.00 | Pesticides | 6.5% |
| 2931.90.30.00 | Products described in additional U.S. note 3 to section VI | 6.5% |
| 2931.90.60.00 | Other | 6.5% |
| 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 |
| 2931.90.90 | Other | 3.7% |
| 2931.90.90.10 | Organo-silicon compounds | |
| 2931.90.90.21 | Dibutyltin oxide | |
| 2931.90.90.25 | Tetrabutyltin | |
| 2931.90.90.29 | Other | |
| 2931.90.90.30 | 2-Chlorovinyldichloroarsine | |
| 2931.90.90.35 | Bis(2-chlorovinyl)chloroarsine | |
| 2931.90.90.40 | Tris(2-chlorovinyl)arsine | |
| 2931.90.90.52 | Other |
Public records · unclaimed listings
U.S. manufacturers in this industry, from public records
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- BEDOUKIAN RESEARCH, INC.
- EMBALMERS' SUPPLY COMPANY, THE
- FMI CHEMICAL, INC.
- HAMPFORD RESEARCH, INC.
- KING INDUSTRIES, INC.
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Exporting this product from the U.S.?
Exports are reported with Schedule B numbers. Heading 2931 has 35 of them; the first 12 are below. Schedule B lookup →
- 2931.10.0000TETRAMETHYL LEAD AND TETRAETHYL LEAD
- 2931.20.0000TRIBUTYLTIN COMPOUNDS
- 2931.41.0000OTHER ORGANO-PHOSPHOROS DERIVATES: DIMETHYL METHYLPHOSPHONATE
- 2931.42.0000OTHER ORGANO-PHOSPHOROS DERIVATIVES: DIMETHYL PROPYLPHOSPHONATE
- 2931.43.0000OTHER ORGANO-PHOSPHOROUS DERIVATIVES: DIETHYL ETHYLPHOSPHONATE
- 2931.44.0000METHYLPHOSPHONIC ACID
- 2931.45.0000OTHER ORGANO-PHOSPHOROUS DERIVATIVES: SALT OF METHYLPHOSPHONIC ACID AND (AMINOIMINOMETHYL) UREA (1:1)
- 2931.46.0000OTHER ORGANO-PHOSPHOROUS DERIVATIVES: 2,4,6-TRIPROPYL-1,3,5,2,4,6-TRIOXATRIPHOSPHINANE 2,4,6-TRIOXIDE
- 2931.47.0000OTHER ORGANO-PHOSPHOROUS DERIVATIVES: (5-ETHYL-2-METHYL-2-OXIDO-1,3,2-DIOXSPHOSPHINAN-5-YL)METHYL METHYL METHYLPHOSPHONATE
- 2931.48.00003,9-DIMETHYL-2,4,8,10-TETRAOXA-3,9-DIPHOSPHASPIRO[5.5] UNDECANE 3,9-DIOXIDE
- 2931.49.0005NON-HAL, O-ALKYL (<=C10, INCLUDING CYCLOALKYL) N,N-DIALKYL (METHYL, ETHYL, N-PROPYL OR ISOPROPYL) PHOSPHORAMIDOCYANIDATES
- 2931.49.0008[O-2-(DIALKYL(METHYL,ETHYL,N-PROPYL/ISOP)AMINO)ETHYL]HYDROG ALKYL(METHYL,ETHYL,N-PROPYL/ISOP)PHOSPHONITE,THEIR O-ALKYL ESTER;ALKYLATED/PROTONATED SLTS
Source: U.S. International Trade Commission, Harmonized Tariff Schedule; Schedule B: U.S. Census Bureau. Information only, not legal or customs advice; U.S. Customs and Border Protection decides the classification and the duty. Confirm with a licensed customs broker before you ship.
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