Product Identification

Product Name

4-Dimethylaminoazobenzene

Synonyms

Butter yellow
Methyl yellow
N,N-Diemthyl-4-(Phenylazo)benzenamine
p-Dimethylaminoazobenzene

CAS

60-11-7

Formula

C14H15N3

Molecular Weight

225.3

EINECS

200-455-7

RTECS

BX7350000

RTECS Class

Tumorigen; Mutagen; Reproductive Effector

Merck

12,3279

Beilstein/Gmelin

746016

Beilstein Reference

4-10-00-01698

EC Class

toxic, carcinogenic

Physical and Chemical Properties

Appearance

Yellow crystal leaflets.

Solubility in water

Insoluble

Melting Point

113 - 117

Boiling Point

371

Vapor Pressure

1E-5 (25 C)

Density

1.2233 g/cm3

pKa/pKb

10.45 (pKb)

Partition Coefficient

4.58

Heat Of Vaporization

61.8 kJ/mol

Heat Of Combustion

-7995 kJ/mol

Usage

For determination of free hydrochloric acid in gastric juice, spot test identification of peroxidized fats, ph indicator (red 2.9, Yellow 4.0).

Vapor Density

7.78

First Aid Measures

Ingestion

If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.

Inhalation

Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.

Skin

Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Remove contaminated clothing and shoes.

Eyes

Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Handling and Storage

Storage

Store in a cool, dry, well-ventilated area away from incompatible substances. Poison room locked. Keep containers tightly closed.

Handling

Wash thoroughly after handling. Use only in a well ventilated area. Do not get in eyes, on skin, or on clothing. Keep container tightly closed. Do not ingest or inhale.

Hazards Identification

Inhalation

May cause respiratory tract irritation.

Skin

May cause severe skin irritation.

Eyes

Contact with eyes may cause severe irritation, and possible eye burns.

Ingestion

Harmful if swallowed. May cause digestive tract disturbances.

EC Risk Phrase

R 25 40

EC Safety Phrase

S 36/37 45

UN (DOT)

3143

Exposure Controls/Personal Protection

Personal Protection

Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.

Respirators

Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.

Exposure Effects

The toxological properties of this substance have not been fully investigated.

Exposure limit(s)

NIOSH REL: Ca See Appendix A OSHA PEL: [1910.1015] See Appendix B

Poison Class

1*

Fire Fighting Measures

Flash Point

178

Fire Fighting

Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Substance is noncombustible. Decomposes at high temperatures, resulting in toxic and corrosive products. Containers may explode when heated. Extinguishing media: Do NOT get water inside containers. Do NOT use straight streams of water. For small fires, use dry chemical, carbon dioxide, or water spray. For large fires, use water spray, fog or regular foam. Cool containers with flooding quantities of water until well after fire is out.

Fire Potential

This material is probably combustible.

Accidental Release Measures

Small spills/leaks

Avoid runoff into storm sewers and ditches which lead to waterways. Clean up spills immediately, using the appropriate protective equipment. Provide ventilation. Do not get water inside containers. Cover with dry earth, dry sand, or other non-combustible material followed with plastic sheet to minimize spreading and contact with water. Stop leak only if you can do so without risk.

Stability and Reactivity

Disposal Code

9

Incompatibilities

Acids - acid anhydrides - oxidizing agents.

Stability

Stable under normal temperatures and pressures.

Decomposition

Nitrogen oxides, carbon monoxide, carbon dioxide, nitrogen.

Combustion Products

Fire may produce irritating, corrosive and/or toxic gases.

Transport Information

UN Number

3143

Hazard Class

6.1

Packing Group

I; II; III

HS Code

2927 00 00