p-Hydroxybenzoic Acid (CAS 99-96-7): Comprehensive User Guide
Table of Contents
1. Product Overview & Specifications
Chemical Profile
- CAS Number: 99-96-7
- IUPAC Name: 4-Hydroxybenzoic acid
- Molecular Formula: C7H6O3
- Molar Mass: 138.12 g/mol
Technical Specifications Comparison
| Parameter | Pharmaceutical Grade | Industrial Grade | Food Grade |
|---|---|---|---|
| Purity (%) | ≥99.5 | ≥98.0 | ≥99.0 |
| Melting Point | 214-217°C | 213-215°C | 214-216°C |
| Heavy Metals | ≤10 ppm | ≤50 ppm | ≤20 ppm |
2. Key Applications & Industry Uses
Pharmaceutical Manufacturing
Essential intermediate for:
- Paraben-based preservatives
- Antiseptic formulations
- Co-crystal engineering
Food Preservation Systems
- pH-stable antimicrobial agent (E-number: E214-E219)
- Effective against yeast/mold in baked goods
- Dairy product shelf-life extension
Cosmetic Chemistry
- Preservative booster in emulsion systems
- Synergistic with phenoxyethanol
- pH range: 4-8 optimal performance
3. Usage Guidelines & Best Practices
Solubility Management
| Solvent | Solubility (g/100ml) | Temperature |
|---|---|---|
| Water | 0.5 | 25°C |
| Ethanol | 45.7 | 25°C |
Formulation Tips
- Optimal concentration: 0.1-0.3% w/w
- Combine with chelating agents for enhanced efficacy
- Avoid strong oxidizers in storage
4. Real-World Case Studies
Case 1: Dairy Preservation System
Client: European Dairy Consortium
- Challenge: Extend yogurt shelf-life by 30%
- Solution: 0.2% p-Hydroxybenzoic acid + calcium propionate
- Result: 42-day microbial stability achieved
Case 2: Topical Antiseptic Formulation
Client: PharmaTech Inc. (USA)
- Challenge: Develop alcohol-free surgical scrub
- Solution: 1.5% p-Hydroxybenzoic acid + chlorhexidine
- Result: 99.99% pathogen reduction (EN 1276)
5. Technical Inquiry & Ordering
Request customized specifications or bulk pricing:
- Email: info@vivalr.com
- Phone: (86) 15866781826
Our chemical engineers will respond within 2 business hours with:
- Material Safety Data Sheet (MSDS)
- Regulatory compliance documentation
- Logistics solutions



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