3,3’-Dichlorobenzidine is a gray or purple
crystalline solid.
3,3'-Dichlorobenzidine Dihydrochloride, is structurally similar to Benzidine (B121000), and thus is considered a carcinogen. It can be used in the production of azo dyes. Dyes and metabolites, Environmental Testing
3,3'-Dichlorobenzidine dihydrochloride reacts as a weak acid. May react vigorously with strong oxidizing agents. May generate flammable gases with strong reducing agents.
Flash point data for 3,3'-Dichlorobenzidine dihydrochloride are not available but 3,3'-Dichlorobenzidine dihydrochloride is probably combustible.
Flammability and Explosibility
Non flammable
Confirmed carcinogen.
Moderately toxic by ingestion. Mutation data
reported. When heated to decomposition it
emits very toxic fumes of Cl and NOx.
A halide-and amine-substituted aromatic compound used in the dye industry, curing agent for
isocyanate terminated resins. The major uses of dichlorobenzidine are in the manufacture of pigments for printing
ink, textiles, plastics, and crayons and as a curing agent
for solid urethane plastics. There are no substitutes for
many of its uses. Additional groups that may be at risk
include workers in the printing or graphic arts professions
handling the 3,3’-DCB-based azo pigments. 3,3’-DCB may
be present as an impurity in the pigments, and there
is some evidence that 3,3’-DCB may be metabolically
liberated from the azo pigment
UN2811 Toxic solids, organic, n.o.s., Hazard
Class: 6.1; Labels: 6.1-Poisonous materials, Technical
Name Required
Incompatible with oxidizers (chlorates,
nitrates, peroxides, permanganates, perchlorates, chlorine,
bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases,
strong acids, oxoacids, and epoxides. Achemical base: neutralize acids to form salts plus water with an exothermic
reaction. May be incompatible with isocyanates, halogenated
organics, peroxides, phenols (acidic), epoxides, anhydrides,
and acid halides. Flammable gaseous hydrogen is generatedby amines in combination with strong reducing agents such
as hydrides, nitrides, alkali metals, and sulfides.
Incineration (816C,
0.5 second for primary combustion; 1204C, 1.0 second for
secondary combustion). The formation of elemental
chlorine can be prevented through injection of steam ormethane into the combustion process. nitrogen oxides
may be abated through the use of thermal or catalytic
devices. Consult with environmental regulatory agencies
for guidance on acceptable disposal practices. Generators
of waste containing this contaminant (≥100 kg/mo) must
conform with EPA regulations governing storage, transportation, treatment, and waste disposal
