Chapter 2920 — Customs Tariff Headings

2920.2Phosphite esters and their salts; their halogenated, sulphonated, nitrated or nitrosated derivatives:

2920.30.00Endosulfan (ISO)

2920.90.00Other

Calculate exact duty for your shipment Not sure about classification? Ask the Tariff Assistant

Products classified under Tariff item 29.20

Methyl Parathion High Purity Reference Standard

This is a high-purity (99%+) methyl-parathion reference standard used for analytical testing and quality control in pesticide residue analysis. It is a separate chemically defined organic compound, specifically the thiophosphoric ester parathion-methyl, which falls squarely under tariff item 2920.11.00.

Parathion 80% Wettable Powder Technical

This is parathion technical material formulated as an 80% wettable powder for easier handling in manufacturing. Although formulated, it remains a thiophosphoric ester (parathion) and is classified under tariff item 2920.11.00, as the formulation does not alter its chemical identity.

Parathion Anhydrous Liquid 98%

This is anhydrous parathion liquid at 98% purity, stabilized with epichlorohydrin for safe transport. The stabilizer is added for safety and does not render the product for specific use, so it remains a separate chemically defined organic compound under tariff item 2920.11.00.

Parathion-Methyl (Methyl Parathion) 97% TC

This is methyl-parathion (ISO) technical concentrate at 97% purity, the primary form used for manufacturing emulsifiable concentrates. As a thiophosphoric ester specifically named in tariff item 2920.11.00, it is classified here regardless of its technical grade.

Parathion-Methyl Sodium Salt Solution 50%

This is an aqueous solution of parathion-methyl sodium salt at 50% active ingredient. Per Chapter 29 Note 1(d), products dissolved in water are covered by the chapter, and per Note 5(C)(1), inorganic salts of organic compounds are classified with the organic compound. Thus, it falls under tariff item 2920.11.00.

Parathion Technical Grade 95%

This is parathion technical grade at 95% purity, a highly toxic organophosphate insecticide. It is a separate chemically defined organic compound, specifically the thiophosphoric ester parathion, and is classified under tariff item 2920.11.00 as the named product.

Bis(4-chlorophenyl) phosphorothioate

Bis(4-chlorophenyl) phosphorothioate is a di-chlorinated aromatic thiophosphoric ester used as a synthetic intermediate and flame retardant. As a separate chemically defined compound, it is classifiable under this tariff item for other thiophosphoric esters.

Cadusafos (S,S'-[[(1R)-1-methylpropylidene]diimino]bis(O,O-diethyl phosphorodithioate)

Cadusafos is a symmetrical phosphorodithioate ester used as a nematicide and insecticide in agriculture. It is a separate chemically defined organic compound, which qualifies it for classification under tariff item 2920.19.00 as an 'other' thiophosphoric ester. The product meets the Chapter 29 requirements for chemically defined compounds.

Cresyl diphenyl phosphorothioate

Cresyl diphenyl phosphorothioate is a mixed aryl thiophosphoric ester used in hydraulic fluids and as an antioxidant in petroleum additives. As a separate chemically defined compound, it falls under this tariff item for other thiophosphoric esters.

Diphenyl phosphorochloridothioate

Diphenyl phosphorochloridothioate is an aromatic thiophosphoric ester chloride intermediate for agricultural chemical synthesis. As a separate chemically defined compound, it is classifiable under this tariff item for other thiophosphoric esters.

Disulfoton 75% Soluble Liquid Concentrate

Disulfoton 75% Soluble Liquid Concentrate is a formulation where the active ingredient, a diethyl thiophosphate ester, determines classification. As a technical material, the thiophosphoric ester component qualifies under tariff item 2920.19.00 as an 'other' phosphorodithioate. The product meets Chapter 29 criteria for chemically defined organic compounds.

Ethion (O,O,O',O'-Tetraethyl S,S'-methylene bis(phosphorodithioate))

Ethion is a bis-phosphorodithioate compound used as a non-systemic insecticide and acaricide. It is a separate chemically defined organic compound, qualifying for tariff item 2920.19.00 as an 'other' thiophosphoric ester. The product meets Chapter 29 requirements for chemically defined compounds.

Fenamiphos (Ethyl 4-(methylthio)-m-tolyl isopropylphosphoramidate)

Fenamiphos is a nematicide containing a phosphoramidate-thioate structure, classifiable under tariff item 2920.19.00 as an 'other' thiophosphoric ester. It is a separate chemically defined organic compound per Chapter 29 note (a). The product meets the purity and identity requirements for classification.

Fenitrothion 97% Pure Active Ingredient

Fenitrothion 97% Pure Active Ingredient is the aromatic thiophosphoric ester O,O-Dimethyl-O-(4-nitro-m-tolyl)phosphorothioate, imported for agricultural chemical manufacturing. As a separate chemically defined organic compound, it falls under tariff item 2920.19.00 for other thiophosphoric esters.

Fenitrothion Anti-Dusting Powder

Fenitrothion Anti-Dusting Powder is Fenitrothion with added anti-dusting agents for safe handling. Per Chapter 29 Note 1(g), the anti-dusting agent is permitted for safety reasons and does not render the product suitable for specific use, so it remains classified under this tariff item.

Fenitrothion Technical Grade 95%

Fenitrothion Technical Grade 95% is a highly concentrated form of O,O-Dimethyl-O-(4-nitro-m-tolyl)phosphorothioate, a thiophosphoric ester used primarily as an insecticide. It is a separate chemically defined compound, classifiable under this tariff item for other thiophosphoric esters.

Fenitrothion with Stabilizer for Export

Fenitrothion with Stabilizer for Export is Fenitrothion stabilized with anticaking agents for transport and storage. Chapter 29 Note 1(f) permits added stabilizers necessary for preservation or transport, so it remains classified under this tariff item for other thiophosphoric esters.

High-Purity Fenitrothion 98% TC

High-Purity Fenitrothion 98% TC is the named aromatic phosphorothioate O,O-Dimethyl-O-(4-nitro-m-tolyl)phosphorothioate for vector control formulations. As a separate chemically defined compound, it is classifiable under this tariff item for other thiophosphoric esters.

Malathion USP Grade (S-[1,2-bis(ethoxycarbonyl)ethyl] O,O-dimethyl phosphorodithioate)

Malathion USP Grade is a pharmaceutical-grade phosphorodithioate used in medical and public health applications such as lice treatment. It is a separate chemically defined organic compound meeting USP purity standards, qualifying for tariff item 2920.19.00 as an 'other' phosphorodithioate. The product meets Chapter 29 requirements for chemically defined compounds.

Methamidophos Technical (O,S-Dimethyl phosphoramidothioate)

Methamidophos Technical is a highly toxic organophosphate insecticide with a phosphorodithioate derivative structure. It is a separate chemically defined organic compound, qualifying for tariff item 2920.19.00 as an 'other' thiophosphoric ester. The product meets Chapter 29 requirements for chemically defined compounds.

O-Ethyl O-(4-nitrophenyl) phosphorothioate

O-Ethyl O-(4-nitrophenyl) phosphorothioate is a nitrosated aromatic thiophosphoric ester used in pharmaceutical intermediate synthesis and as an analytical reagent. As a separate chemically defined compound, it falls under this tariff item for other thiophosphoric esters.

O,O-Diethyl phosphorodithioic acid S-(p-chlorophenyl) ester

Dicapthon is a chlorinated thiophosphoric ester used as an insecticide. It is a separate chemically defined organic compound, qualifying for tariff item 2920.19.00 as an 'other' halogenated phosphorodithioate. The product meets Chapter 29 requirements for chemically defined compounds.

O,O-Diethyl S-(2-chlorophenyl) phosphorothioate

O,O-Diethyl S-(2-chlorophenyl) phosphorothioate is an aromatic thiophosphoric ester used as a Tolylfluanid intermediate in pesticide synthesis. As a separate chemically defined compound, it is classifiable under this tariff item for other thiophosphoric esters.

O,O-Diethyl S-(2-ethylthioethyl) phosphorodithioate

Disulfoton is a thiophosphoric ester used as a systemic insecticide in agriculture. It is a separate chemically defined organic compound, qualifying for tariff item 2920.19.00 as a phosphorodithioate ester of other inorganic acids of nonmetals. The product meets Chapter 29 requirements for chemically defined compounds.

O,O-Diethyl S-(4-methylphenyl) phosphorothioate

O,O-Diethyl S-(4-methylphenyl) phosphorothioate is a para-tolyl substituted aromatic phosphorodithioate used in acaricide formulations. As a separate chemically defined compound, it falls under this tariff item for other thiophosphoric esters.

O,O-Dimethyl S-(N-methylcarbamoylmethyl) phosphorodithioate

Dimethoate is a systemic organophosphate insecticide and acaricide used on various crops. It is a separate chemically defined organic compound, qualifying for tariff item 2920.19.00 as an 'other' thiophosphoric ester. The product meets Chapter 29 requirements for chemically defined compounds.

O,O-Dimethyl S-phenyl phosphorothioate

O,O-Dimethyl S-phenyl phosphorothioate is a simple aromatic phosphorodithioate ester serving as an intermediate for insecticide synthesis and analytical standards. As a separate chemically defined compound, it is classifiable under this tariff item for other thiophosphoric esters.

O-Phenyl O-(2-naphthyl) phosphorothioate

O-Phenyl O-(2-naphthyl) phosphorothioate is a polycyclic aromatic thiophosphoric ester for UV stabilizer applications in plastics. As a separate chemically defined compound, it falls under this tariff item for other thiophosphoric esters.

Phenoxyphenyl phosphorothioate

Phenoxyphenyl phosphorothioate is a complex aromatic thiophosphoric ester featuring ether-linked phenyl rings, used in specialty polymer additives. As a separate chemically defined compound, it is classifiable under this tariff item for other thiophosphoric esters.

Phorate Technical Grade (O,O-Diethyl S-[(ethylthio)methyl] phosphorodithioate)

Phorate Technical Grade is a systemic insecticide and nematicide used in soil treatment. It is a separate chemically defined organic compound, qualifying for tariff item 2920.19.00 as an 'other' thiophosphoric ester. The product meets Chapter 29 requirements for chemically defined compounds.

Profenofos (O-(4-Bromo-2-chlorophenyl) O-ethyl S-propyl phosphorothioate)

Profenofos is an insecticide with a bromo-chloro phenyl phosphorothioate structure. It is a separate chemically defined organic compound, qualifying for tariff item 2920.19.00 as a halogenated thiophosphoric ester. The product meets Chapter 29 requirements for chemically defined compounds.

Prothiofos (O-(4-bromo-2-chlorophenyl) O-ethyl S-propyl phosphorodithioate)

Prothiofos is a brominated and chlorinated thiophosphate insecticide. It is a separate chemically defined organic compound, qualifying for tariff item 2920.19.00 as a halogenated phosphorodithioate. The product meets Chapter 29 requirements for chemically defined compounds.

Sulfotep (O,O,O',O'-Tetraethyl S,S'-methylene bis(phosphorodithioate))

Sulfotep is a bis-phosphorodithioate fumigant used in greenhouses. It is a separate chemically defined organic compound, qualifying for tariff item 2920.19.00 as an 'other' thiophosphoric ester. The product meets Chapter 29 requirements for chemically defined compounds.

Temephos Technical Grade

Temephos Technical Grade is a larvicide used in mosquito control programs. It is a tetra-thiophosphoric ester, qualifying for tariff item 2920.19.00 as an 'other' phosphorodithioate. The product meets Chapter 29 purity standards for chemically defined compounds.

Terbufos (O,O-Diethyl S-[[(1,1-dimethylethyl)thio]methyl] phosphorodithioate)

Terbufos is a broad-spectrum insecticide used for corn rootworm control. It is a separate chemically defined thiophosphoric ester, qualifying for tariff item 2920.19.00 as an 'other' phosphorodithioate. The product meets Chapter 29 requirements for chemically defined compounds.

Triphenyl phosphorothioate

Triphenyl phosphorothioate is a trisubstituted aromatic thiophosphoric ester used as a flame retardant additive and lubricant extreme pressure agent. As a separate chemically defined compound, it falls under this tariff item for other thiophosphoric esters.

Dimethyl Phosphite (DMP)

Dimethyl phosphite (DMP), a colorless liquid organophosphorus compound with the formula (CH3O)2P(O)H. It is a separate chemically defined organic compound classified under tariff item 2920.21.00 as a phosphite ester of an inorganic acid of a non-metal. It serves as a key intermediate in the production of pesticides, flame retardants, and other chemicals.

Dimethyl Phosphite in Aqueous Solution 50%

Dimethyl phosphite in aqueous solution at 50% concentration, prepared for safe transport. This solution falls under tariff item 2920.21.00 as a product of a separate chemically defined organic compound dissolved in water, per Chapter 29 Note 1(d). It is used in corrosion inhibitors and other industrial applications.

Dimethyl Phosphite Reagent Grade

Reagent-grade dimethyl phosphite meeting ACS specifications for laboratory use. As a separate chemically defined organic compound, it is classified under tariff item 2920.21.00 per Chapter 29 Note 1(a). It is ideal for research and development in phosphonate chemistry.

Dimethyl Phosphite with Stabilizer

Dimethyl phosphite stabilized with BHT (butylated hydroxytoluene) for transport stability. Chapter 29 Note 1(f) permits added stabilizers necessary for preservation or transport without changing classification. This product falls under tariff item 2920.21.00 and is used in herbicide production and other applications.

Distilled Dimethyl Phosphite 99%

High-purity distilled dimethyl phosphite with 99% assay, used as an intermediate in pesticide production. As a separate chemically defined organic compound with the formula (CH3O)2P(O)H, it is classified under tariff item 2920.21.00 per Chapter 29 Note 1(a).

High Assay Dimethyl Phosphite 99.5%

Ultra-high purity dimethyl phosphite at 99.5% for pharmaceutical intermediates. This separate chemically defined organic compound is classified under tariff item 2920.21.00 as a phosphite ester. Its high purity supports sensitive chemical reactions in pharmaceutical synthesis.

Industrial Grade Dimethyl Phosphite

Industrial-grade dimethyl phosphite with 97-98% purity, used in manufacturing water treatment agents and as a reducing agent. It is classified under tariff item 2920.21.00 as a pure phosphite ester, meeting the criteria for a separate chemically defined organic compound.

Purified Dimethyl Phosphite for Pesticides

Purified dimethyl phosphite for glyphosate synthesis, a key agrochemical intermediate. As a separate chemically defined organic compound, it is classified under tariff item 2920.21.00 per Chapter 29 Note 1(a). It is essential in the production of herbicides.

Stabilized Dimethyl Phosphite Bulk

Bulk stabilized dimethyl phosphite with an anti-caking agent for industrial handling. Chapter 29 Note 1(f) allows added anti-caking agents necessary for preservation or transport. This product is classified under tariff item 2920.21.00 and is applied in polymer additives.

Technical Dimethyl Phosphite for Flame Retardants

Technical-grade dimethyl phosphite designed for flame retardant production. As a pure phosphite ester, it is classified under tariff item 2920.21.00 per Chapter 29 Note 1(a). It reacts to form phosphorus-containing polymers used in flame retardants.

Bulk Diethyl Phosphite in ISO Tanks

Bulk diethyl phosphite shipped in ISO tanks for industrial chemical distribution. The product is a separate chemically defined organic compound of heading 29.20, and the ISO tank is transport packaging that does not alter its classification.

Diethyl Phosphite

Diethyl phosphite, a colorless liquid organophosphorus compound with the formula (C2H5O)2P(O)H, is a separate chemically defined phosphite ester of an inorganic acid of a non-metal. It meets the Chapter 29 criteria for classification under heading 29.20.

Diethyl Phosphite 98% Technical Grade

Technical grade diethyl phosphite at 98% purity is a separate chemically defined compound, even with minor impurities. It is used in industrial synthesis of herbicides like glyphosate intermediates and falls under heading 29.20 as a phosphite ester.

Diethyl Phosphite Flame Retardant Intermediate

Diethyl phosphite used as an intermediate for synthesizing phosphorus-based flame retardants is a separate chemically defined compound. Its end use does not affect classification under heading 29.20, which covers phosphite esters by chemical identity.

Diethyl Phosphite for Glyphosate Synthesis

High-purity diethyl phosphite specifically for glyphosate synthesis is a separate chemically defined compound. The intended use in agrochemical production does not change its classification under heading 29.20.

Diethyl Phosphite with 50ppm BHT Stabilizer

Diethyl phosphite with 50 ppm BHT stabilizer is a separate chemically defined compound with an added stabilizer necessary for preservation. Under Chapter 29 Note 1(f), such additions do not remove the product from heading 29.20.

Distilled Diethyl Phosphite 99.5% Purity

Vacuum-distilled diethyl phosphite at 99.5% purity is a separate chemically defined compound. High purity does not affect classification under heading 29.20, which covers phosphite esters regardless of purity level.

Stabilized Diethyl Phosphite with MEHQ Inhibitor

Diethyl phosphite stabilized with 100 ppm MEHQ inhibitor is a separate chemically defined compound with an added stabilizer for preservation. Chapter 29 Note 1(f) permits such additions without changing the classification under heading 29.20.

99% Pure Trimethyl Phosphite

High-purity trimethyl phosphite (99%) is a separate chemically defined organic compound with the formula P(OCH3)3, an ester of phosphorous acid. It is used as a reagent in fine chemical synthesis for agrochemicals and polymers, and meets the criteria of Chapter 29 Note 1(a) as a chemically defined compound without added substances.

Distilled Trimethyl Phosphite 98%

Distilled trimethyl phosphite at 98% purity is a separate chemically defined organic compound, an ester of phosphorous acid. It is used in pharmaceutical phosphonate synthesis and qualifies under Chapter 29 Note 1(a) as a chemically defined compound, even with minor impurities.

Industrial Grade Trimethyl Phosphite

Industrial-grade trimethyl phosphite is a separate chemically defined organic compound used in large-scale production of flame retardants and plasticizers. It meets Chapter 29 Note 1(a) criteria as a chemically defined compound, and its industrial grade does not exclude it from the heading.

Stabilized Trimethyl Phosphite

Stabilized trimethyl phosphite contains an added stabilizer for safe transport, which is permitted under Chapter 29 Note 1(f) as a stabilizer necessary for preservation or transport. It remains classified as a phosphite ester under tariff item 2920.23.00, provided the stabilizer does not make it suitable for a specific use.

Technical Trimethyl Phosphite

Technical-grade trimethyl phosphite is a separate chemically defined organic compound used in pesticide manufacturing. It qualifies under Chapter 29 Note 1(a) as a chemically defined compound, and technical grade does not preclude classification as long as it is not a formulated product.