Chapter 2931 — Customs Tariff Headings

2931.20.00Tibutyltin compounds

2931.4Non-halogenated organo-phosphorous derivatives:

2931.5Halogenated organo-phosphorous derivatives :

2931.90.00Other

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Products classified under Tariff item 29.31

High-Purity Tetraethyl Lead (99.99%)

High-purity tetraethyl lead (99.99%) is a separate chemically defined organo-inorganic compound, explicitly named in tariff item 2931.10.00. It is imported for research or calibration standards, meeting Chapter 29 note 1(a) as a pure compound without impurities that alter its general use.

Industrial Tetraethyl Lead Concentrate

Industrial tetraethyl lead concentrate is a chemically defined organo-inorganic compound used for fuel blending. It falls under tariff item 2931.10.00 as the named compound, provided it is not put up in a form for retail sale or mixed with other substances that would change its classification.

Stabilized Tetramethyl Lead for Transport

Stabilized tetramethyl lead for transport includes a stabilizer necessary for preservation or transport, as allowed by Chapter 29 note 1(f). The product remains a separate chemically defined compound under tariff item 2931.10.00, as the stabilizer does not render it suitable for a specific use.

Tetraethyl Lead Anti-Dusting Formulation

Tetraethyl lead anti-dusting formulation contains a minimal anti-dusting agent added for safety, as permitted by Chapter 29 note 1(g). The product is classified under tariff item 2931.10.00 because the addition does not make it particularly suitable for a specific use beyond general handling.

Tetraethyl Lead Calibration Standard

Tetraethyl lead calibration standard is a certified analytical standard, often dissolved in water or another solvent for use in spectroscopy. It falls under tariff item 2931.10.00 as a separate chemically defined compound, provided the solvent is for safety or transport and not for a specific analytical use.

Tetraethyl Lead (TEL)

Tetraethyl lead (TEL) is a colorless, oily liquid organometallic compound with the formula Pb(C2H5)4, historically used as an antiknock additive in gasoline. It is explicitly named in tariff item 2931.10.00 and qualifies as a separate chemically defined organo-inorganic compound under Chapter 29.

Tetraethyl Lead with Stabilizer

Tetraethyl lead with stabilizer includes an anticaking agent necessary for preservation or transport, as allowed by Chapter 29 note 1(f). The product remains classified under tariff item 2931.10.00, as the stabilizer does not alter its general use or make it suitable for a specific application.

Tetramethyl Lead Research Grade

Research-grade tetramethyl lead with added identification coloring for lab safety is classified under tariff item 2931.10.00. The colouring substance is added for safety reasons, as permitted by Chapter 29 note 1(g), and does not render the product suitable for a specific use.

Tetramethyl Lead (TML)

Tetramethyl lead (TML) is a liquid organolead compound with the formula Pb(CH3)4, used as an antiknock agent. It is explicitly named in tariff item 2931.10.00 and qualifies as a separate chemically defined organo-inorganic compound under Chapter 29.

Bis(tributyltin) Oxide

Bis(tributyltin) oxide, also known as TBTO, is a separate chemically defined organo-inorganic compound containing two tributyltin groups linked by an oxygen atom. It falls under tariff item 2931.20.00 as a tributyltin compound, consistent with Chapter 29 rules for organo-inorganic compounds.

Tributyltin Acetate

Tributyltin acetate is a separate chemically defined organo-inorganic compound with a tributyltin group esterified with acetic acid. It is classified under tariff item 2931.20.00 as a tributyltin compound, following Chapter 29 ester classification rules.

Tributyltin Chloride

Tributyltin chloride is a separate chemically defined organo-inorganic compound with three butyl groups and a chlorine atom directly linked to tin. It is classified under tariff item 2931.20.00 as a tributyltin compound, commonly used as an intermediate in organic synthesis.

Tributyltin Fluoride

Tributyltin fluoride is a separate chemically defined organo-inorganic compound with a fluoride atom directly linked to the tributyltin group. It falls under tariff item 2931.20.00 as a tributyltin compound, used in niche organic synthesis applications.

Tributyltin Laurate

Tributyltin laurate is a tributyltin salt of lauric acid, a separate chemically defined compound classified under tariff item 2931.20.00 as a tributyltin compound. It is used as a heat stabilizer in plastics processing.

Tributyltin Neodecanoate

Tributyltin neodecanoate combines a tributyltin group with a neodecanoic acid ester, classified under tariff item 2931.20.00 as a tributyltin compound. It is applied as a catalyst in silicone and polyurethane systems.

Tributyltin Oxide

Tributyltin oxide, also known as TBTO, is a separate chemically defined organotin compound with three butyl groups and oxygen bound to tin. It is classified under tariff item 2931.20.00 as a tributyltin compound, commonly used as a biocide.

99% Pure DMMP Flame Retardant Grade

High-purity (99%) dimethyl methylphosphonate (DMMP) is a non-halogenated organo-phosphorus compound used primarily as a flame retardant precursor for polyurethane foams and textiles. Its chemical structure, CH3PO(OCH3)2, contains phosphorus directly linked to carbon, placing it squarely within heading 29.31 as an organo-inorganic compound. The product is a separate chemically defined organic compound, meeting the scope of Chapter 29.

Dimethyl Methylphosphonate (DMMP)

Dimethyl methylphosphonate (DMMP) is a colorless liquid with the chemical formula CH3PO(OCH3)2, classified as a non-halogenated organo-phosphorus compound. As a separate chemically defined organic compound with phosphorus-carbon bonds, it falls under heading 29.31 and specifically under tariff item 2931.41.00. It is used in various industrial applications including as a flame retardant and chemical intermediate.

DMMP for Polyurethane Foam Production

This specialty grade of dimethyl methylphosphonate is optimized for reactive flame retardancy in flexible polyurethane foams. It is a pure non-halogenated organo-phosphorus compound, chemically identical to standard DMMP, and therefore classified under tariff item 2931.41.00. The product's specific application does not alter its chemical classification under Chapter 29.

Industrial DMMP Chemical Intermediate

Industrial bulk dimethyl methylphosphonate is used as a phosphorylating agent in pharmaceutical synthesis and pesticide production. As a non-halogenated organo-phosphorus compound with a defined chemical structure, it is classified under tariff item 2931.41.00. The product is a separate chemically defined organic compound within the scope of Chapter 29.

Laboratory Grade Dimethyl Methylphosphonate

Laboratory grade dimethyl methylphosphonate is a high-assay chemical supplied in small quantities for research and analytical applications. As a separate chemically defined non-halogenated organo-phosphorus compound, it falls under tariff item 2931.41.00. The product is used in NMR spectroscopy and other analytical techniques, but its chemical identity determines its classification.

99% Pure Dimethyl Propylphosphonate Technical Grade

High-purity technical grade dimethyl propylphosphonate (>99%) used in pharmaceutical synthesis and as a flame retardant precursor. This separate chemically defined organo-inorganic compound falls under tariff item 2931.42.00 as a non-halogenated organo-phosphorous derivative, meeting Chapter 29's requirements for pure compounds.

CAS 6768-94-1 Dimethyl Propylphosphonate

Laboratory-grade dimethyl propylphosphonate (CAS 6768-94-1) for R&D in agrochemicals and polymer additives. As a pure, non-halogenated organo-phosphorus derivative, it is classified under tariff item 2931.42.00, consistent with Chapter 29's coverage of separate chemically defined organic compounds.

Dimethyl Propylphosphonate (DMPP)

Dimethyl propylphosphonate (DMPP) is a non-halogenated organo-phosphorus compound with the formula CH3CH2CH2P(O)(OCH3)2, classified under tariff item 2931.42.00 as a specific organo-inorganic derivative. It serves as a key intermediate in the synthesis of various chemicals, including flame retardants and agrochemicals.

DMPP Flame Retardant Precursor

Dimethyl propylphosphonate (DMPP) specifically packaged for use as a precursor in phosphorus-based flame retardants for textiles and plastics. Classified under tariff item 2931.42.00 as a separate chemically defined organo-inorganic compound, provided it is not put up in a form that makes it suitable for a specific use beyond its general chemical properties.

Industrial Dimethyl Propylphosphonate Bulk Drums

Bulk dimethyl propylphosphonate supplied in 200L drums for manufacturing flame retardants and herbicides. This precisely matches tariff item 2931.42.00 as the named non-halogenated organo-phosphorus compound, without excluded additives under Chapter 29 notes.

Pharma-Grade Dimethyl Propylphosphonate

Pharmaceutical intermediate grade dimethyl propylphosphonate meeting USP standards for drug synthesis. This pure organo-inorganic phosphorus compound is classified under tariff item 2931.42.00, not excluded under Chapter 29 notes, and is suitable for use in pharmaceutical manufacturing.

Stabilized Dimethyl Propylphosphonate for Transport

Dimethyl propylphosphonate with added stabilizer for safe long-distance transport, compliant with Chapter 29 Note 1(f). Used in synthesis of specialty polymers; classified under tariff item 2931.42.00 as the stabilizer is necessary for preservation or transport and does not render the product suitable for a specific use.

DEEP Stabilized with 0.1% Antioxidant

Diethyl ethylphosphonate stabilized with 0.1% antioxidant for transport and storage stability. The added stabilizer is necessary for preservation or transport and does not render the product particularly suitable for a specific use, qualifying it under Chapter 29 Note 1(f). This is the named compound of tariff item 2931.43.00.

Diethyl Ethylphosphonate

Diethyl ethylphosphonate (DEEP), a non-halogenated organo-phosphorus compound used primarily as a chemical intermediate in organic synthesis and flame retardant production. It is the exact compound named in tariff item 2931.43.00, which is the sole tariff item in subheading 2931.43.

Diethyl Ethylphosphonate 98% Technical Grade

Technical grade diethyl ethylphosphonate at 98% purity, used in industrial synthesis of organophosphorus compounds and as a flame retardant additive precursor. As the named compound of tariff item 2931.43.00, it is classified here regardless of purity, provided it is a separate chemically defined compound per Chapter 29 Note 1(a).

Diethyl Ethylphosphonate in 10% Ethanol Solution

Diethyl ethylphosphonate dissolved in a 10% ethanol solution for safe transport. The ethanol solution is a normal and necessary method of putting up the product for safety or transport, and the solvent does not make the product particularly suitable for a specific use, per Chapter 29 Note 1(e). The product is the named compound of tariff item 2931.43.00.

High Purity Diethyl Ethylphosphonate 99.5%+

Ultra-high purity diethyl ethylphosphonate (99.5%+) for pharmaceutical intermediate and specialty chemical synthesis. It is the named compound of tariff item 2931.43.00, and the high purity does not affect classification as it remains a separate chemically defined compound under Chapter 29 Note 1(a).

High Purity Methylphosphonic Acid for Synthesis

High purity methylphosphonic acid (99.9%) is a separate chemically defined organo-inorganic compound containing a phosphorus atom directly linked to carbon. It is classified under tariff item 2931.44.00 as a non-halogenated organo-phosphorous derivative, specifically methylphosphonic acid. This product is intended for laboratory and pharmaceutical synthesis, meeting the criteria of Chapter 29 Note 1(a).

Methylphosphonic Acid (99% Purity)

Methylphosphonic acid (99% purity) is a separate chemically defined organo-inorganic compound with the formula CH3P(O)(OH)2, containing phosphorus directly linked to carbon. It falls under tariff item 2931.44.00 as a non-halogenated organo-phosphorous derivative. The product is used in various chemical syntheses and meets Chapter 29 Note 1(a) requirements.

Methylphosphonic Acid Aqueous Solution (50%)

A 50% aqueous solution of methylphosphonic acid is classifiable under tariff item 2931.44.00 per Chapter 29 Note 1(d), which allows products of this heading dissolved in water. The solution is used in metal surface treatment and as a catalyst intermediate. The water does not render the product particularly suitable for a specific use, maintaining classification under this item.

Stabilized Methylphosphonic Acid Flakes

Stabilized methylphosphonic acid flakes contain minimal stabilizers added for safe transport, which is permitted under Chapter 29 Note 1(f). The product is used in polymer flame retardant production and falls under tariff item 2931.44.00 as a non-halogenated organo-phosphorous derivative. The stabilizer does not alter the product's general use.

Technical Grade Methylphosphonic Acid

Technical grade methylphosphonic acid is a white crystalline powder used in industrial chemical processes. It is a separate chemically defined organo-inorganic compound and falls under tariff item 2931.44.00 as a non-halogenated organo-phosphorous derivative. The technical grade may contain impurities, which are allowed under Chapter 29 Note 1(a).

Bulk Glyphosate Ammonium Salt Drums

Bulk industrial packaging of monammonium glyphosate salt, the 1:1 salt of methylphosphonic acid and (aminoiminomethyl)urea, in 500 kg drums for herbicide manufacturing. This separate chemically defined organo-phosphorus compound falls under tariff item 2931.45.00 as it matches the specified salt description.

Glyphosate Ammonium 98% TC

Technical concentrate of 98% monammonium glyphosate salt, the precise 1:1 salt of methylphosphonic acid and (aminoiminomethyl)urea. This non-halogenated organo-phosphorus compound is a separate chemically defined product used as an herbicide active ingredient, qualifying under tariff item 2931.45.00.

Glyphosate Technical Grade (Monammonium Salt)

Monammonium salt of glyphosate, chemically identified as the salt of methylphosphonic acid and (aminoiminomethyl)urea in 1:1 ratio, used as the active ingredient in herbicide formulations. It falls under tariff item 2931.45.00 as a separate chemically defined compound.

Monammonium Glyphosate USP Grade

Ultra-pure monammonium salt of glyphosate meeting USP standards, specifically the 1:1 salt under tariff item 2931.45.00. Used in research and pharmaceutical-grade herbicide development as a chemically defined organo-phosphorus compound.

O-Palm Glyphosate IPA/Monammonium Salt

Industrial-grade monammonium salt of glyphosate matching tariff item 2931.45.00 specification, used in palm oil plantation herbicides. This separate chemically defined compound qualifies under Chapter 29 as a non-halogenated organo-phosphorus salt.

Roundup ProMax Active Ingredient

Pure monammonium glyphosate salt used as the core active component in professional herbicide products like Roundup ProMax. Classified under tariff item 2931.45.00 due to its exact chemical identity as the specified salt of methylphosphonic acid and (aminoiminomethyl)urea.

2,4,6-Tripropyl-1,3,5,2,4,6-trioxatriphosphinane 2,4,6-trioxide

2,4,6-Tripropyl-1,3,5,2,4,6-trioxatriphosphinane 2,4,6-trioxide is a specific non-halogenated organo-phosphorus compound with a trioxatriphosphinane ring structure and propyl groups attached to phosphorus atoms. It is classified under tariff item 2931.46.00 as it is explicitly named in the tariff description and meets the definition of an organo-inorganic compound under Chapter 29.

Cyclic Tripropyl Phosphonite Oxide Catalyst Precursor

This specialty chemical grade of 2,4,6-tripropyl-1,3,5,2,4,6-trioxatriphosphinane 2,4,6-trioxide is used as a precursor for phosphinite-based catalysts in hydroformylation processes. It is classified under tariff item 2931.46.00 as the compound is specifically named in the tariff description, regardless of its intended use as a catalyst precursor.

Tripropyl Phosphorothioate Flame Retardant Intermediate

This high-purity grade of 2,4,6-tripropyl-1,3,5,2,4,6-trioxatriphosphinane 2,4,6-trioxide is used as an intermediate in synthesizing phosphorus-based flame retardants for plastics. It is classified under tariff item 2931.46.00 because the compound is explicitly named in the tariff description, and its use as an intermediate does not affect classification.

Tripropyl Trioxatriphosphinane Polymer Stabilizer

This technical grade of 2,4,6-tripropyl-1,3,5,2,4,6-trioxatriphosphinane 2,4,6-trioxide is used in polymerization stabilization for engineering plastics production. It is classified under tariff item 2931.46.00 as the compound is specifically named in the tariff description, and the technical grade still meets the definition of a separate chemically defined compound.

(5-Ethyl-2-methyl-2-oxido-1,3,2-dioxaphosphinan-5-yl) methyl methyl methylphosphonate

> (5-Ethyl-2-methyl-2-oxido-1,3,2-dioxaphosphinan-5-yl) methyl methyl methylphosphonate is a chemically defined organo-inorganic compound with phosphorus atoms directly linked to carbon. It falls under tariff item 2931.47.00 as a non-halogenated organo-phosphorous derivative, matching the exact product description of this item.

Cyclic Phosphinate Pesticide Precursor

> This cyclic phosphinate pesticide precursor is the same chemical compound as described in tariff item 2931.47.00. Its use as an intermediate for pesticide synthesis does not change its classification, as the tariff item covers the specific chemical structure regardless of end use.

Dioxaphosphinane Phosphonate 98% Technical Grade

> This technical grade (98% purity) product is the same organo-phosphorous compound specified in tariff item 2931.47.00. The purity level does not affect classification under this item, which covers the chemically defined compound whether or not containing impurities.

Organophosphorus Plasticizer Additive Precursor

> This organophosphorus plasticizer additive precursor is the identical chemical compound listed in tariff item 2931.47.00. Its intended use as a precursor for plasticizers does not alter its classification, as the tariff item is defined by the chemical structure.

Phosphonate Flame Retardant Intermediate 2931.47

> This phosphonate flame retardant intermediate is the same chemical compound specified in tariff item 2931.47.00. The product's role as an intermediate for flame retardants does not change its classification under this item, which covers the specific non-halogenated organo-phosphorous compound.

3,9-Dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 3,9-dioxide

This is the pure chemical compound 3,9-dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 3,9-dioxide, a non-halogenated organo-phosphorus derivative. It is a separate chemically defined organic compound with phosphorus atoms directly linked to carbon, falling under heading 29.31 and specifically under tariff item 2931.48.00.

Antioxidant 552 (3,9-Dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 3,9-dioxide)

Antioxidant 552 is the commercial grade of 3,9-dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 3,9-dioxide, a non-halogenated organo-phosphorus stabilizer used in polymers. Even as a commercial product, it is the same chemically defined compound and is classified under tariff item 2931.48.00.

CAS 65481-32-7 3,9-Dimethylspiro[5.5]undecane Phosphonate Dioxide

This is the pure compound identified by CAS 65481-32-7, which is 3,9-dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 3,9-dioxide. It is a non-halogenated organo-phosphorus compound used as a building block for ligands, and it falls under tariff item 2931.48.00.

DOPO Derivative 3,9-Dimethylspiro Phosphonate

This DOPO derivative is precisely 3,9-dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 3,9-dioxide, a non-halogenated organo-phosphorus compound used in flame-retardant synthesis. It is classified under tariff item 2931.48.00 as the specific named compound.