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4-Hydroxybenzoic acid, also known as p-hydroxybenzoic acid (PHBA), is a monohydroxybenzoic acid, a phenolic derivative of benzoic acid. It is a white crystalline solid that is slightly soluble in water and chloroform but more soluble in polar organic solvents such as alcohols and acetone. 4-Hydroxybenzoic acid is primarily known as the basis for the preparation of its esters, known as parabens, which are used as preservatives in cosmetics and some ophthalmic solutions. It is isomeric with 2-hydroxybenzoic acid, known as salicylic acid, a precursor to aspirin.
PRODUCT NAME | 4-Hydroxybenzoic acid | ||
CAS No.: | 99-96-7 | ||
Synonyms | |||
Formula: | C7H6O3 | Molecular Weight: | 138.12100 |
PSA: | 57.53000 | LogP: | 1.09040 |
Structure:
Description
Appearance & Physical State: | White to beige crystalline powder |
Density: | 1.46 g/cm3 |
Melting Point: | 214-217ºC |
Boiling Point: | 336.2ºC at 760 mmHg |
Flash Point: | 199ºC |
Refractive Index: | 1.53 |
Water Solubility: | 5 g/L (20 ºC) |
Stability: | Stable under normal temperatures and pressures. |
Storage Condition: | Store in a cool, dry place. Keep container closed when not in use. |
RTECS: | DH1925000 |
Safety Statements: | S26-S37/39 |
HS Code: | 2916399090 |
WGK Germany: | 1 |
Risk Statements: | R36/37/38 |
Hazard Codes: | Xi |
Certificate of Analysis
ProductName: 4-Hydroxybenzoic acid
Cas: 99-96-7
Batch No.: 20110702
MFG Date: July.02.2011
Analysis Date: July.02.2011
Inspect Item | Quantity Standard | Inspection Result |
Appearance | White crystalline powder | Conforms |
Content (as dry basis) | ≥99.0 % | 99.2% |
Melting point | 213-216°C | Conforms |
Smell | Tasteless | Conforms |
Solubility | Clear and transparent | Conforms |
Loss on drying | ≤0.50% | Conforms |
Chroma (Pt - Co) | ≤40 | Conforms |
Ash | ≤0.15% | Conforms |
Sulfate(SO42-) | ≤0.05% | Conforms |
Chloride(Cl-) | ≤0.02% | Conforms |
Phenol | ≤0.10% | Conforms |
Salicylic acid | ≤0.10% | Conforms |
Conclusion | In accordance with enterprise standard |
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