3,3'-DICHLOROBENZIDINE

PRODUCT IDENTIFICATION

CAS NO. 91-94-1

3,3'-DICHLOROBENZIDINE

EINECS NO. 202-109-0
FORMULA NH2ClC6H3C6H3ClNH2
MOL WT.

253.13

H.S. CODE 2921.59
TOXICITY  
SYNONYMS 3,3'-Dichloro-4,4'-Biphenyldiamine; o,o'-Dichlorobenzidine;
4,4'-Diamino-3,3'-Dichlorobiphenyl; Dichlorobenzidine; DCB; C.I. 23060; 3,3'-Dichlorobiphenyl-4,4'-diamine; 3,3'-Dichloro-4,4'-Diaminobiphenyl; 3,3-Dichlorobenzidine; 3,3'-Dichloro(1,1'-biphenyl)-4,4'-diamine; 3,3'-Dichlorobenzidin (Czech); 3,3'-Dichlorobenzidina (Spanish); 3,3'-二氯對二氨基聯苯 (Chinese);
SMILES

 

CLASSIFICATION

 

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE

white to grey white crystalline powder

MELTING POINT 132 - 133 C
BOILING POINT 368 C
SPECIFIC GRAVITY  
SOLUBILITY IN WATER Insoluble
AUTOIGNITION 350 C
pH  
VAPOR DENSITY 2.86
NFPA RATINGS  

REFRACTIVE INDEX

 
FLASH POINT

 

STABILITY Stable under ordinary conditions. Oxidizes in light

APPLICATIONS

3,3'-Dichlorobenzidine, white to grey white crystalline powder with a mild odor, is a synthetic chlorinated primary aromatic amine. It does not occur naturally. Commercially, hydrochloride salt forms are available for stability, Though 3,3'-Dichlorobenzidine does not evaporate, it is unstable in water, in air and if exposed to sunlight. It is used in the manufacture of  polybenzimidazole used in protective clothing applications like firefighters' apparels, welders' garments and rescues garments. 3,3'-dichlorobenzidine and its salts and some derivatives are primarily used as an intermediate in the manufacture of pigments (mainly yellow and some red and orange ) for printing inks, coatings, textiles, paints, rubber, leather, plastic, and related industries. It is also used in the analytical test to determine the presence of gold. Curing agent in the synthesis of polyurethane is one of 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.

Product

CAS RN

2,2'-Dichlorobenzidine 84-68-4
3,3'-Dichlorobenzidine 91-94-1
3,3'-Dichlorobenzidine dihydrochloride 612-83-9
Dichlorobenzidine 1331-47-1
p-Dianisal-3,3'-dichlorobenzidine 3540-78-1
2,2'-Dichlorobenzidine dihydrochloride 5742-07-4
N,N'-Bisbenzylidene-3,3'-dichlorobenzidine 10147-75-8
3,5-Dichlorobenzidine 63390-11-4
3,3'-Dichlorobenzidine sulphate (1:1) 64414-68-2
3,3'-Dichlorobenzidine sulphate (1:2) 64969-34-2
2,2'-Dichlorobenzidine sulfate (1:1) 70146-07-5
N-Acetyl-3,3'-dichlorobenzidine 72732-23-1
3,3'-Dichlorobenzidine diethyl malonate hydrazone 103124-60-3
SALES SPECIFICATION
3,3-DICHLOROBENZIDINE

APPEARANCE

white to grey white crystalline powder

PURITY

99.0% min

INDIVIDUAL IMPURITIES

0.5% max

MELTING POINT

130 C min

3,3-DICHLOROBENZIDINE HYDROCHLORIDE

APPEARANCE

white to grey wet powder

CONTENT

93.0% min

ACID VALUE

22.0 - 23.0%

AMINE VALUE

72.0% min

TRANSPORTATION
PACKING 20kg in bag
HAZARD CLASS 6.1 (Packing Group: III)
UN NO. 2811
OTHER INFORMATION
Hazard Symbols: T N, Risk Phrases: 45-21-43-50/53, Safety Phrases: 53-45-60-61