4-Hydroxybenzoic Acid
4-Hydroxybenzoic acid (parabens precursor) is a phenolic carboxylic acid used as a preservative intermediate and in polymer production. Classified under HTS 2918.29.7500 for its phenol-function carboxylic acid structure without additional oxygen groups beyond OH and COOH. Pure form meets Chapter 29 requirements for separate organic compounds.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If aromatic carboxylic acids with alcohol function
Presence of additional alcohol groups beyond phenolic OH would shift classification within 2918.29.
If primarily imported as ester precursors with nitrogen functions
Note 5(A) prioritizes esters classification to later numerical heading if dual-function.
If for industrial mixtures with >2% impurities
Chapter notes exclude impure mixtures from pure compound headings.
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Import Tips & Compliance
• Provide spectral analysis (NMR/IR) confirming structure; comply with TSCA inventory listing; avoid plastic packaging that could cause contamination leaching
Related Products under HTS 2918.29.75.00
Salicylic Acid
Salicylic acid is a beta-hydroxy acid derived from phenol with a carboxylic acid group, used in skincare for acne treatment and as a precursor in aspirin synthesis. It falls under HTS 2918.29.7500 as a carboxylic acid with phenol function but without other oxygen function, meeting Chapter 29's criteria for separate chemically defined organic compounds. Its structure features a phenolic OH and COOH directly attached to the benzene ring.
Gentisic Acid
Gentisic acid (2,5-dihydroxybenzoic acid) features phenolic carboxylic acid functionality used in pharmaceuticals and as an antioxidant. Falls under HTS 2918.29.7500 as 'other' phenolic carboxylic acids without additional oxygen functions beyond multiple phenolic OH groups. Chemically defined per Chapter 29 note 2(a).
Protocatechuic Acid
Protocatechuic acid (3,4-dihydroxybenzoic acid) is a natural phenolic acid used in cosmetics and as a biochemical reagent. HTS 2918.29.7500 covers this dihydroxybenzoic acid as a carboxylic acid with phenol function. Pure crystalline form qualifies under Chapter 29 organic compound definitions.
Vanillic Acid
Vanillic acid (4-hydroxy-3-methoxybenzoic acid) serves as a flavor precursor and pharmaceutical intermediate with phenolic carboxylic structure. Classified in HTS 2918.29.7500 as 'other' phenolic acids without prohibited additional functions. Methoxy group doesn't alter phenol function classification.
Syringic Acid
Syringic acid (4-hydroxy-3,5-dimethoxybenzoic acid) is used in lignin research and as an antioxidant standard. HTS 2918.29.7500 applies to this trimethoxy phenolic carboxylic acid as an 'other' compound per heading description. Qualifies as chemically defined organic compound.
Gallic Acid
Gallic acid (3,4,5-trihydroxybenzoic acid) is a triphenolic carboxylic acid used in inks, tanning, and pharmaceuticals. Falls under HTS 2918.29.7500 as phenolic carboxylic acid without other oxygen functions. Multiple phenolic OH groups maintain classification here per tariff structure.