Phthalic Anhydride Flakes
Phthalic anhydride in flake form is a key aromatic polycarboxylic anhydride used primarily in the production of plasticizers for PVC and polyester resins. It falls under HTS 2917.39.04.00 as it is specifically listed as 'Phthalic acid' (understood to include its anhydride form per tariff convention). This chemically defined organic compound meets Chapter 29 note (a) for separate compounds.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If imported as technical grade with impurities >1%
Impure forms may fall under 'other' aromatic polycarboxylic anhydrides rather than specifically listed pure phthalic anhydride.
If dissolved in solvent for transport exceeding safety-only criteria
Solutions beyond Chapter 29 note (e) transport exceptions classified as chemical preparations, not pure compounds.
If misidentified as monocarboxylic industrial intermediate
Incorrect heading if principal function mistaken; must confirm dicarboxylic structure for Chapter 29 heading 2917.
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Import Tips & Compliance
• Provide Certificate of Analysis (COA) confirming purity >99% as phthalic anhydride to avoid reclassification as mixtures
• Ensure DOT/UN proper shipping name 'Phthalic anhydride' documentation for hazardous material transport (UN 2214)
• Verify no added stabilizers beyond Chapter 29 note (f) limits to prevent exclusion from pure compound classification
Related Products under HTS 2917.39.04.00
Trimellitic Anhydride Powder
Trimellitic anhydride (1,2,4-benzenetricarboxylic acid 1,2-anhydride) powder is used in wire enamels, polyester resins, and plasticizers. Explicitly listed under HTS 2917.39.04.00 as a separate chemically defined aromatic polycarboxylic anhydride per Chapter 29 scope. Meets criteria for pure organic compounds without excluded additives.
Phthalic Acid Crystals
Phthalic acid (1,2-benzenedicarboxylic acid) in crystalline form serves as an intermediate for phthalic anhydride production and direct use in resins. Specifically enumerated under HTS 2917.39.04.00 as an aromatic polycarboxylic acid. Qualifies as chemically defined compound per Chapter 29 note (a).
4-Sulfo-1,8-Naphthalic Anhydride
4-Sulfo-1,8-naphthalic anhydride is a sulfonated aromatic polycarboxylic anhydride used in fluorescent brighteners and dye intermediates. Explicitly listed in HTS 2917.39.04.00 covering sulfonated derivatives per Chapter notes. Chemically defined compound with sulfo group directly characterized.
Phthalic Anhydride 99.8% Pure Technical Grade
High-purity technical grade phthalic anhydride (99.8% min) for phthalate ester production in coatings and adhesives. Specifically covered under HTS 2917.39.04.00 listing with trace maleic anhydride impurity allowed per industry standards. Meets 'separate chemically defined' criteria.
Industrial Phthalic Anhydride Molten
Molten phthalic anhydride delivered in heated tankers for direct pipeline feed to alkyd resin plants. Remains classified under HTS 2917.39.04.00 as the pure chemical compound in transport form. Physical state does not affect chemical classification per tariff conventions.