p-Hydroxybenzoic acid , StandardforGC,≥99.5%(GC) , 99-96-7
Synonym(s):
p-HBA;p-Hydroxybenzoic acid;4-Hydroxybenzoic acid
CAS NO.：99-96-7
Empirical Formula: C7H6O3
Molecular Weight: 138.12
MDL number: MFCD00002547
EINECS: 202-804-9
| Pack Size | Price | Stock | Quantity |
| 5G | RMB50.40 | In Stock |
|
| others | Enquire |
PRODUCT Properties
| Melting point: | 213-217 °C (lit.) |
| Boiling point: | 213.5°C (rough estimate) |
| Density | 1,46 g/cm3 |
| vapor pressure | 0Pa at 20℃ |
| FEMA | 3986 | 4-HYDROXYBENZOIC ACID |
| refractive index | 1.4600 (estimate) |
| Flash point: | 199 °C |
| storage temp. | Store below +30°C. |
| solubility | methanol: soluble5%, clear to slightly hazy, colorless to faintly yellow |
| form | Crystalline Powder |
| pka | 4.48(at 19℃) |
| color | White to ivory |
| PH | 3.3 (1g/l, H2O, 20℃) |
| Odor | at 100.00 %. phenolic nutty |
| Odor Type | phenolic |
| Water Solubility | 5 g/L (20 ºC) |
| Merck | 14,4812 |
| JECFA Number | 957 |
| BRN | 970950 |
| InChIKey | FJKROLUGYXJWQN-UHFFFAOYSA-N |
| LogP | 0.878 at 22℃ |
Description and Uses
4-Hydroxybenzoic acid, also known as p-hydroxybenzoic acid or 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 alcohol and acetone. It is isomeric with salicylic acid (2-hydroxybenzoic acid), a forerunner to aspirin, and 3-hydroxybenzoic acid. The esters of 4-hydroxybenzoic acid, also called parabens, are widely used as preservatives in cosmetics and some ophthalmic solutions.
p-Hydroxybenzoic acid is of significant commercial importance. The most familiar application is the use of several of its esters as preservatives, known as parabens. Also of interest is the use in liquid crystal polymer applications.
Safety
| Symbol(GHS) |   GHS05,GHS07 |
| Signal word | Danger |
| Hazard statements | H318-H335 |
| Precautionary statements | P261-P271-P280-P304+P340+P312-P305+P351+P338-P403+P233 |
| Hazard Codes | Xi |
| Risk Statements | 36-36/37/38 |
| Safety Statements | 26-37/39-36 |
| WGK Germany | 1 |
| RTECS | DH1925000 |
| Autoignition Temperature | >250 °C |
| TSCA | Yes |
| HS Code | 29182930 |
| Toxicity | LD50 orally in Rabbit: > 5000 mg/kg |
