Home Categories Organic Chemistry p-Hydroxybenzoic acid
A4711512

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
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Update time: 2022-07-08

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

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