p-Hydroxybenzoic acid
p-Hydroxybenzoic Acid: High-Quality Pharmaceutical and Industrial Grade
p-Hydroxybenzoic acid is a versatile organic compound widely used in pharmaceuticals, cosmetics, and food preservation. As a leading manufacturer, we provide premium quality p-Hydroxybenzoic acid that meets international industry standards.
Product Specifications:
- Chemical Name: 4-Hydroxybenzoic acid
- CAS Number: 99-96-7
- Molecular Formula: C7H6O3
- Appearance: White crystalline powder
- Purity: ≥99.5%
- Melting Point: 213-217°C
- Solubility: Soluble in ethanol, ether; slightly soluble in water
Technical Parameters:
| Parameter | Specification |
|---|---|
| Assay (HPLC) | ≥99.5% |
| Loss on Drying | ≤0.5% |
| Residue on Ignition | ≤0.1% |
| Heavy Metals (as Pb) | ≤10 ppm |
| Chloride (Cl) | ≤100 ppm |
| Sulfate (SO4) | ≤200 ppm |
Applications of p-Hydroxybenzoic Acid:
- Pharmaceutical intermediate for paraben production
- Preservative in cosmetics and personal care products
- Food additive (E214) for antimicrobial properties
- Organic synthesis intermediate
- Dye and pigment manufacturing
Packaging Options:
- 25 kg fiber drums with polyethylene liner
- 1 kg aluminum foil bags
- Custom packaging available upon request
Storage Conditions:
Store p-Hydroxybenzoic acid in a cool, dry place away from direct sunlight. Keep container tightly closed when not in use. Shelf life is 24 months from production date when stored properly.
Frequently Asked Questions About p-Hydroxybenzoic Acid
Q: What is the primary use of p-Hydroxybenzoic acid?
A: p-Hydroxybenzoic acid is primarily used as a precursor for parabens (alkyl esters of p-hydroxybenzoic acid), which are widely employed as preservatives in cosmetics, pharmaceuticals, and food products. Its antimicrobial properties make it valuable for preventing bacterial and fungal growth in various applications.
Q: Is p-Hydroxybenzoic acid safe for human use?
A: When used according to industry guidelines and regulatory limits, p-Hydroxybenzoic acid is considered safe. The FDA and other regulatory bodies have approved its use in specific concentrations. However, some individuals may experience sensitivity to parabens derived from p-Hydroxybenzoic acid, which is why many manufacturers now offer paraben-free alternatives.
Q: How does p-Hydroxybenzoic acid differ from other benzoic acid derivatives?
A: p-Hydroxybenzoic acid contains a hydroxyl group in the para position (position 4) on the benzene ring, which gives it different chemical properties compared to other isomers like o-hydroxybenzoic acid (salicylic acid) or m-hydroxybenzoic acid. This structural difference affects its solubility, acidity, and biological activity, making p-Hydroxybenzoic acid particularly suitable for preservation applications.
Q: What are the handling precautions for p-Hydroxybenzoic acid?
A: While p-Hydroxybenzoic acid has low acute toxicity, proper handling procedures should be followed. Use personal protective equipment including gloves and safety glasses when handling. Avoid inhalation of dust and contact with eyes and skin. In case of contact, rinse immediately with plenty of water. Ensure adequate ventilation in working areas.
Q: Can p-Hydroxybenzoic acid be used in organic food production?
A: The use of p-Hydroxybenzoic acid and its derivatives in organic food production is generally restricted. While it's an effective preservative, most organic certification standards prohibit synthetic preservatives. However, it may be present naturally in some foods as it occurs in certain plants like carrots and olives.
Q: What is the global production capacity of p-Hydroxybenzoic acid?
A: Global production of p-Hydroxybenzoic acid exceeds 10,000 metric tons annually, with major production facilities in China, Europe, and North America. Demand has been steadily increasing due to its wide range of applications, though some markets have seen reduced demand in cosmetic applications due to the "paraben-free" trend.
Quality Assurance
Our p-Hydroxybenzoic acid undergoes rigorous quality control testing to ensure consistency and purity. Each batch is accompanied by a Certificate of Analysis detailing all specifications. We comply with ISO 9001:2015 quality management system and adhere to cGMP standards for pharmaceutical-grade products.
Custom Solutions
We offer customized formulations of p-Hydroxybenzoic acid to meet specific application requirements. Our technical team can develop particle size distributions, purity grades, or packaging solutions tailored to your production needs. Contact our sales team to discuss your specific requirements.