p-HYDROXYBENZOIC ACID

PRODUCT IDENTIFICATION
CAS NO. 99-96-7

p-HYDROXYBENZOIC ACID

EINECS NO. 202-804-9
FORMULA HOC6H4COOH
MOL WT. 138.12

H.S. CODE

 2918.29.2200

TOXICITY

 Oral rat LD50: > 10 gm/kg
SYNONYMS 4-Hydroxybenzoic Acid; p-Salicylic Acid; p-HBA;
4-Hydroxybenzenecarboxylic acid; Acido p-idrossibenzoico (Italian); 4-Hydroxybenzoova Kyselina; 4-Carboxyphenol; 4-Hydroxybenzoesäure (German); ácido 4-hidroxibenzoico (Spanish); Acide 4-hydroxybenzoïque (French); 4-Carboxyphenol; Acido p-idrossibenzoico; p-Oxybenzoesaure;
SMILES c1(C(O)=O)ccc(O)cc1

CLASSIFICATION

Carboxylic Acid, Preservative

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE white crystalline powder
MELTING POINT 215 - 217 C
BOILING POINT  
SPECIFIC GRAVITY

1.48

SOLUBILITY IN WATER slightly soluble (5000 mg/l at 25 C)
SOLVENT SOLUBILITY

soluble in hot alcohol, ether slightly soluble in chloroform practically insoluble in carbon disulfide

VAPOR DENSITY

 

pKa 4.54 (Dissociation Constant at 20 C)
log Pow 1.58 (Octanol-water)
VAPOR PRESSURE (mmHg at 25 C)
HENRY'S LAW 1.13E-11 (atm-m3/mole at 25 C)
OH RATE 1.30E-11 (cm3/molecule-sec at 25 C Atmospheric)
AUTOIGNITION

 

NFPA RATINGS Health: 1; Flammability: 0; Reactivity: 0

REFRACTIVE INDEX

  
FLASH POINT

 

STABILITY

Stable under ordinary conditions

GENERAL DESCRIPTION & EXTERNAL LINKS
p-Hydroxybenzoic Acid, one of three crystalline derivatives of benzoic acid, is a white crystalline powder; slightly soluble in water, soluble in hot alcohol, ether; melts at 215 C. It contains both hydroxyl and carboxyl group at para-position, which react with either  acid or alcohol. p-Hydroxybenzoic acid is used for the preperaion of biocides, antiseptics and bacteriostatic agents.  It is used as a chemical intermediate for synthetic drugs, pharamceuticals, dyes and plasticizers.

Wikipedia Linking: http://en.wikipedia.org/wiki/P-hydroxybenzoic_acid

http://onlinelibrary.wiley.com/
Liquid Crystal Polymers. I. Preparation and Properties of p-Hydroxybenzoic Acid Copolyesters:...In an attempt to increase the Tg of the polyester, increase its flame resistance, and impart unusual physical properties, we increased the aromatic character of the polyester by modifying it with p-hydroxybenzoic acid. This was accomplished by a reaction similar to that developed by Hamb, who found that copolyesters could be prepared by the reaction of poly(ethy1ene terephthalate) with 4,4'-isopropylidenediphenol diacetate and an equimolar amount of terephthalic acid.....

http://www.articlesbase.com/
According to 'A Consumers Dictionary of Cosmetic Ingredients', water is the only cosmetic ingredient used more frequently than paraben preservatives. (Winter, 2005) Paraben is the family name for the following permutations of the ingredient found on a common product ingredient label:
- Butylparaben
- Ethylparaben
- Methylparaben
- Propylparaben
- Benzyl-parahydroxybenzoic acid (p-hydroxybenzoic acid)
- Methyl-parahydroxybenzoic acid (p-hydroxybenzoic acid)
- Ethyl-parahydroxybenzoic acid (p-hydroxybenzoic acid)
- Propyl-parahydroxybenzoic acid (p-hydroxybenzoic acid)
- Butyl-parahydroxybenzoic acid (p-hydroxybenzoic acid)
- Parahydroxybenzoic acid (p-hydroxybenzoic acid)
- Parahydroxybenzoate (p-hydroxybenzoate)

SALES SPECIFICATION

APPEARANCE

 white crystalline powder

ASSAY

99.0% min

SOLUBILITY

Clear and transparent

LOSS ON DRYING

0.5% max

ASH

0.15% max

SULFATE

0.05% max

CHLORIDE

0.02% max

PHENOL

0.1% max

SALICYLIC ACID

0.1% max

MELTING POINT

 213 - 216 C
TRANSPORTATION
PACKING
25kgs in bag
HAZARD CLASS Not regulated
UN NO.  
OTHER INFORMATION
Hazard Symbols: XI, Risk Phrases: 36/37/38, Safety Phrases: 26-36