2-Phosphonobutane-1,2,4-tricarboxylic acid (PBTC)
PBTC is a multifunctional organo-phosphorus chelating agent with phosphorus directly linked to carbon, widely used in water treatment, detergents, and corrosion inhibitors. It is explicitly named in HTS 2931.90.70.00 as a specific organo-inorganic compound, including its various salts.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If not explicitly PBTC or its salts
Catch-all for other organo-inorganic; statistical suffix 70.00 requires exact chemical identity
If imported pre-formulated as pesticide/herbicide
Finished pesticide products classified by use rather than chemical constituent
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Import Tips & Compliance
• Salts (sodium, potassium, ammonium) classified with acid per Chapter 29 note 3(C)(1); declare salt form and counterion ratio
• Provide end-use statement distinguishing industrial chelator from pesticide intermediates potentially under Chapter 38
• Ensure 98%+ purity certification; technical grade vs. analytical grade affects documentation requirements
Related Products under HTS 2931.90.70.00
N,N'-Bis(trimethylsilyl) Urea
N,N'-Bis(trimethylsilyl) urea is a chemically defined organo-silicon compound containing silicon atoms directly linked to carbon, used primarily as a silylating agent in organic synthesis and as a reagent in pharmaceutical manufacturing. It falls under HTS 2931.90.70.00 as one of the specifically named organo-inorganic compounds in this statistical suffix.
3-(Hydroxymethylphosphinyl)-1-propanoic acid, 2-hydroxyethyl ester
This organo-phosphorus compound, also known as HPPA hydroxyethyl ester, features phosphorus directly bonded to carbon and is used as a phosphonate intermediate in agrochemical synthesis and flame retardants. HTS 2931.90.70.00 specifically lists this compound among named organo-inorganic chemicals per the tariff description.
Sodium Salt of 2-Phosphonobutane-1,2,4-tricarboxylic acid
The tetrasodium salt of PBTC is the most common commercial form, offering better water solubility for cooling water treatment and scale inhibition applications. Classified with parent acid under HTS 2931.90.70.00 per Chapter 29 inorganic salt classification rules.
Ammonium Salt of 2-Phosphonobutane-1,2,4-tricarboxylic acid
Ammonium PBTC salt provides volatility control in certain detergent and cleaning formulations where sodium salts cause residue issues. Falls under HTS 2931.90.70.00 as salt of specifically named organo-inorganic acid.
N,N'-Bis(trimethylsilyl) Urea Technical Grade
Technical grade N,N'-Bis(trimethylsilyl) urea (95%+ purity) serves as silylating reagent for carbohydrate protection in nucleoside synthesis. Specifically enumerated in HTS 2931.90.70.00 distinguishing it from general silanes.
PBTC 50% Aqueous Solution
50% PBTC in water represents standard commercial concentration for water treatment injection systems. Remains classified under HTS 2931.90.70.00 per Chapter 29 note 1(d) allowing aqueous solutions of named compounds.