4-Hydroxybenzoic acid CAS 99-96-7

Chemical Name: 4-Hydroxybenzoic acid
Synonyms: P-Hydroxybenzoic acid; 4-Carboxyphenol; 4-Hydroxybenzoesure
CAS: 99-96-7
Molecular Fomula: C7H6O3
Molecular Weight: 138.12
Appearance: White Powder
Purity: 99.0%
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COA of P-hydroxybenzoic acid 99-96-7

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Table of Contents

4-Hydroxybenzoic Acid (CAS 99-96-7) Overview

Chemical Profile

4-Hydroxybenzoic acid (para-hydroxybenzoic acid), a monohydroxybenzoic acid derivative, serves as precursor for parabens and liquid crystal polymers. Its molecular formula is C7H6O3 with molecular weight 138.12 g/mol.

Technical Specifications

Parameter Pharma Grade Industrial Grade Food Grade
Purity ≥99.5% ≥98% ≥99%
Melting Point 213-215°C
Solubility 1g/100ml (water) 1g/80ml (ethanol) 1g/120ml (water)

Quality Standards

  • USP-NF Compliance
  • REACH Registered
  • Kosher Certification Available

Industrial Applications

Pharmaceutical Intermediate

Key precursor for β-blockers and antispasmodic medications. Exhibits bacteriostatic properties in topical formulations.

Food Preservation

Effective antimicrobial agent in baked goods (0.1-0.3% concentration) and beverage systems (pH 3-5 compatibility).

Polymer Production

Critical monomer for liquid crystal polymers (LCPs) with heat resistance up to 280°C in engineering plastics.

Operational Guidelines

Storage Recommendations

  • Store in airtight containers at 15-25°C
  • Maximum humidity: 60% RH
  • Shelf life: 36 months unopened

Handling Protocols

Use NIOSH-approved respirators when handling powder form. Solubilize in ethanol/water mixtures (1:3 ratio) for optimal dispersion.

Client Success Stories

Case 1: European Pharma Manufacturer

Client: Top 10 EU generic drug producer
Application: Synthesis of cardiovascular APIs
Outcome: 18% yield improvement through optimized crystallization process

Case 2: Asian Food Additive Company

Client: Leading SEA preservative supplier
Application: Natural food preservation systems
Result: Extended shelf life by 40% in acidic beverages

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