Product Identification

Product Name

3,3'-Dichlorobenzidine

Synonyms

3,3-Dichloro-(1,1-biphenyl)-4,4diamine
4-(4-Amino-3-chlorophenyl)-2-chloroaniline
4,4'-Diamino-3,3'-dichlorobiphenyl
Dichlorobenzidine base

CAS

91-94-1

Formula

C12H10Cl2N2

Molecular Weight

253.13

EINECS

202-109-0

RTECS

DD0525000

RTECS Class

Tumorigen; Mutagen; Reproductive Effector

Merck

12,3109

Beilstein/Gmelin

2108022

Beilstein Reference

4-13-00-00384

EC Index Number

612-068-00-4

EC Class

Carcinogenic Category 2; Harmful; Sensitising; Dangerous for the Environment

Physical and Chemical Properties

Appearance

Gray to purple crystalline powder.

Solubility in water

Insoluble

Melting Point

132-133

Boiling Point

368

Vapor Pressure

4E-6 (25 C)

pKa/pKb

11.30 (pKb)

Partition Coefficient

3.02

Heat Of Vaporization

63.4 kJ/mol

Usage

Manufacture azo dyes.

First Aid Measures

Ingestion

DO NOT INDUCE VOMITING. If the victim is conscious and not convulsing, give 1 or 2 glasses of water to dilute the chemical and IMMEDIATELY call a hospital or poison control center. Be prepared to transport the victim to a hospital if advised by a physician. If the victim is convulsing or unconscious, do not give anything by mouth, ensure that the victim's airway is open and lay the victim on his/her side with the head lower than the body. DO NOT INDUCE VOMITING. IMMEDIATELY transport the victim to a hospital.

Inhalation

IMMEDIATELY leave the contaminated area; take deep breaths of fresh air. IMMEDIATELY call a physician and be prepared to transport the victim to a hospital even if no symptoms (such as wheezing, coughing, shortness of breath, or burning in the mouth, throat, or chest) develop. Provide proper respiratory protection to rescuers entering an unknown atmosphere. Whenever possible, Self-Contained Breathing Apparatus (SCBA) should be used.

Skin

IMMEDIATELY flood affected skin with water while removing and isolating all contaminated clothing. Gently wash all affected skin areas thoroughly with soap and water. IMMEDIATELY call a hospital or poison control center even if no symptoms (such as redness or irritation) develop. IMMEDIATELY transport the victim to a hospital for treatment after washing the affected areas.

Eyes

First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop.

Handling and Storage

Storage

Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.

Handling

All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.

Hazards Identification

Ingestion

Nausea, vomiting and diarrhea are possible if ingested.

Inhalation

Cough, tachypnea, and wheezing are common after inhalation.

Skin

Redness, swelling and pain may occur.

Eyes

Irritants may cause swelling, redness and pain at any site, especially at mucous membranes. The mouth, nose, and eyes are susceptible to these effects.

Hazards

When heated, vapors may form explosive mixtures with air: indoors, outdoors, and sewers explosion hazards.

UN (DOT)

1885

Exposure Controls/Personal Protection

Personal Protection

Wear appropriate protective gloves, clothing and goggles.

Respirators

Wear positive pressure self-contained breathing apparatus (SCBA).

Exposure limit(s)

TLV: ppm; mg/m3 A2 (skin) (ACGIH 1993-1994).

Poison Class

1*

Fire Fighting Measures

Flash Point

186

Autoignition

350

Fire Fighting

This compound is not very flammable but any fire involving this compound may produce dangerous vapors. You should evacuate the area. All firefighters should wear full-body protective clothing and use self-contained breathing apparatuses. You should extinguish any fires involving this chemical with a dry chemical, carbon dioxide, foam, or halon extinguisher.

Fire Potential

This material is combustible.

Accidental Release Measures

Small spills/leaks

You should dampen the solid spill material with acetone, then transfer the dampened material to a suitable container. Use absorbent paper dampened with acetone to pick up any remaining material. Seal your contaminated clothing and the adsorbent paper in a vapor-tight plastic bag for eventual disposal. Solvent wash all contaminated surfaces with acetone followed by washing with a strong soap and water solution. Do not reenter the contaminate area until the Safety Officer (or other responsible person) has verified that the area has been properly cleaned.

Stability and Reactivity

Incompatibilities

Incompatible with isocyanates, halogenated organics, peroxides, phenols (acidic), epoxides, anhydrides, and acid halides Flammable gaseous hydrogen is generated in combination with strong reducing agents, such as hydrides.

Stability

No data.

Decomposition

When heated to decomposition it emits very high toxic fumes of hydrogen chloride and nitrogen oxides.

Combustion Products

Elemental chlorine and nitrogen oxide may be liberated upon incineration.

Transport Information

UN Number

1885

Hazard Class

6.1

Packing Group

II