BENZIDINE

PRODUCT IDENTIFICATION

CAS NO. 92-87-5

BENZIDINE

EINECS NO. 202-199-1
FORMULA NH2C6H4C6H4NH2
MOL WT. 184.24

H.S. CODE

 
TOXICITY  
SYNONYMS p-Diaminodiphenyl; Bensidine; Benzydyna;
1,1'-Biphenyl-4,4'-Diamine; 4,4'-diamino-1,1'-biphenyl; 4,4'-Diaminobiphenyl; 4,4'-Bianiline; 4,4'-Biphenyldiamine; 4,4'-Diphenylenediamine; p-benzidine; Benzidine base; C.I. 37225; C.I. Azoic Diazo Component 112;
SMILES nitrobenzene reduction to hydrazobenzene in alkaline medium

CLASSIFICATION

 

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE white to slightly reddish crystalline powder
MELTING POINT 128 C
BOILING POINT 401 - 402 C
SPECIFIC GRAVITY 1.25
SOLUBILITY IN WATER Sparingly soluble
pH  
VAPOR DENSITY 5.81

AUTOIGNITION

 

NFPA RATINGS

Health: 1; Flammability: 1; Reactivity: 0

REFRACTIVE INDEX

 
FLASH POINT 77 C
STABILITY stable under ordinary conditions

GENERAL DESCRIPTION AND APPLICATIONS

Benzidine is an arylamine compound with the structure of biphenyl having two amine groups at para position each. It is a white to slightly reddish crystalline powder turns dark on exposure to air and light; melting point of 128 C. This compound decomposes on heating and reacts violently with strong oxidants, particularly nitric acid. It is produced by the action of acids on hydrazobenzene. Benzidne forms a blue precipitate with hemoglobin. It was used in testing for occult blood, its use is now limited because of cancer suspect. It is important in azo dye production due to strong fix to cotton. It and its derivatives have active applications in the synthesis of dyes, pigments, paints, rubber compounding agents and wide range of organic chemicals.
SALES SPECIFICATION

APPEARANCE

white to slightly reddish crystalline powder

ASSAY

95.0% min

TRANSPORTATION

PACKING  
HAZARD CLASS 6.1 (Packing Group II)
UN NO. 1885
OTHER INFORMATION
Hazard Symbols: T, Risk Phrases: 45-22-50/53, Safety Phrases: 53-45-60-61