4-Hydroxybenzoic Acid USP Grade
USP-grade 4-Hydroxybenzoic acid (synonym for p-Hydroxybenzoic acid) meets pharmaceutical standards for purity, directly classifiable under HTS 2918.29.22.00 as the specified chemically defined compound. Used primarily in drug synthesis and as a preservative precursor.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If aromatic with additional substituents
Salts of p-Hydroxybenzoic acid or substituted derivatives go to separate subheadings.
If pre-mixed into pharmaceutical preparations
Medicinal preparations containing the acid shift to Chapter 30 per exclusions.
If diluted for lab reagent use
Chemical preparations for lab analysis are mixtures under 3824, not pure compounds.
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Import Tips & Compliance
• Provide USP certificate of analysis; FDA registration may be required for pharma intermediates
• Label as 'not for direct food use' to prevent reclassification under food additive regulations
• Check for stabilizer additions; per Chapter note (f), only transport stabilizers allowed or it becomes 3824
Related Products under HTS 2918.29.22.00
p-Hydroxybenzoic Acid (PHBA)
p-Hydroxybenzoic acid is a chemically defined organic compound with a carboxylic acid group and a phenol function, classified under HTS 2918.29.22.00 as it matches the specific description for this phenolic carboxylic acid without other oxygen functions. It serves as a key intermediate in pharmaceutical and cosmetic synthesis.
p-Hydroxybenzoic Acid Technical Grade
Technical grade p-Hydroxybenzoic acid with 98-99% purity is still classified as the separate chemically defined compound under HTS 2918.29.22.00, provided impurities don't alter its chemical identity per Chapter 29 note (a). Commonly used in industrial synthesis of parabens and polymers.
Parabens Precursor p-Hydroxybenzoic Acid
This high-purity p-Hydroxybenzoic acid is marketed specifically as precursor for methylparaben and propylparaben preservatives, but remains classified under HTS 2918.29.22.00 as the base chemically defined acid with phenol function.
p-Hydroxybenzoic Acid Flake Form
p-Hydroxybenzoic acid processed into stable flake form for easier handling and transport qualifies under HTS 2918.29.22.00 as the pure compound with allowed anti-dusting agent per Chapter note (g), without rendering it for specific use.
Industrial p-Hydroxybenzoic Acid 99% Min
Industrial-grade p-Hydroxybenzoic acid at minimum 99% purity is the specified compound of HTS 2918.29.22.00, used in liquid crystal polymer production and as UV absorber intermediate.