Benzotriazole

  • 1H-Benzotriazol
  • 1,2,3-Triazaindene
  • 1,2,3-Benzotriazole
  • Azimidobenzene
Formula
C6H5N3
Structure
Description
White to light tan crystalline powder, odorless.
Uses
Photographic restrainer, chemical intermediate.

Registry Numbers and Inventories.
CAS
95-14-7
EC (EINECS/ELINCS)
202-394-1
EC Class
harmful, irritant, dangerous for the environment
R 20/21/22 36/37/38 40 52
S 22 26 36/37/39
RTECS
DM1225000
RTECS class
Agricultural Chemical and Pesticide; Tumorigen; Mutagen
UN (DOT)
2811
Merck
13,1109
Beilstein/Gmelin
112133
Beilstein Reference
4-26-00-00093
Swiss Giftliste 1
G-8192
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C6H5N3
Formula mass
119.13
Melting point, °C
99
Boiling point, °C
350
Vapor pressure, mmHg
2.4E-5 (25 C)
Vapor density (air=1)
4.1
Density
1.34 g/cm3
Solubility in water
20 g/L
pKa/pKb
5.63 (pKb)
Partition coefficient, pKow
1.44
Heat of fusion
7.7 kJ/mol
Heat of vaporization
60.5 kJ/mol
Heat of combustion
-3318 kJ/mol

Hazards and Protection.
Storage
Keep away from heat, sparks, and flame. Store in a cool, dry place. Keep from contact with oxidizing materials.
Handling
Wash thoroughly after handling. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with skin and eyes. Avoid contact with heat, sparks and flame. Avoid ingestion and inhalation. Wash clothing before reuse.
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 gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to minimize contact with skin.
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.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container. Clean up spills immediately, using the appropriate protective equipment. Avoid generating dusty conditions. Remove all sources of ignition. Provide ventilation.
Stability
Stable under normal shipping and handling conditions. However, may decompose if heated.
Incompatibilities
Strong oxidizing agents.
Decomposition
Nitrogen oxides, carbon monoxide, carbon dioxide.

Fire.
Flash Point,°C
186
Autoignition, °C
400
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Use water spray to keep fire-exposed containers cool. This material in sufficient quantity and reduced particle size is capable of creating a dust explosion. Containers may explode when heated. To extinguish fire, use water, dry chemical, chemical foam, or alcohol-resistant foam.
Health
2
 
Flammability
1
 
 
Reactivity
0
 

Health.
Poison_Class
4
Exposure effects
Effects may be delayed.
   Ingestion
May cause irritation of the digestive tract. Moderately toxic to humans by ingestion. May be harmful if swallowed. May cause central, peripheral, and autonomic nervous system effects.
   Inhalation
May cause respiratory tract irritation. May be harmful if inhaled. May cause central, peripheral, and autonomic nervous system effects.
   Skin
Causes skin irritation.
   Eyes
Causes eye irritation.

First aid
 
   Ingestion
Do NOT induce vomiting. 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.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid if cough or other symptoms appear. DO NOT use mouth-to-mouth respiration.
   Skin
Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Get medical aid if irritation develops or persists. Wash clothing before reuse.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number
2811
Response guide
HS Code
2933 99 90