1,2,4-Triazole

  • Pyrrodiazole
  • 1H-1,2,4-Triazole
Formula
C2H3N3
Structure
Description
Pale yellow crstals with a characteristic odor.

Registry Numbers and Inventories.
CAS
288-88-0
EC (EINECS/ELINCS)
206-022-9
EC Index Number
613-111-00-X
EC Class
Toxic for reproduction Category 3; Harmful; Irritant
R 22 36 63
RTECS
XZ3806000
RTECS class
Drug; Primary Irritant
Merck
12,9735
Beilstein/Gmelin
104767
Beilstein Reference
5-26-01-00082
EPA OPP
600074
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C2H3N3
Formula mass
69.07
Melting point, °C
116 - 119
Boiling point, °C
260
Vapor pressure, mmHg
0.02 (25 C)
Density
1.394 g/cm3 (25 C)
Solubility in water
1250 g/L
Surface tension
42.12 g/s2 (149 C)
pKa/pKb
10.18 (pKa)
Partition coefficient, pKow
-1.20
Heat of fusion
15.50 kJ/mol
Heat of vaporization
47.8 kJ/mol
Heat of combustion
-1322 kJ/mol

Hazards and Protection.
Storage
Store in a cool, dry place. Store in a tightly closed container.
Handling
Avoid breathing dust, vapor, mist, or gas. Avoid contact with skin and eyes.
Protection
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.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container.
Disposal code
3
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents.
Decomposition
Hydrogen cyanide, nitrogen oxides, carbon monoxide, carbon dioxide, ammonia.

Fire.
Flash Point,°C
140
Autoignition, °C
490
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 agent most appropriate to extinguish fire.

Health.
Exposure effects
   Ingestion
Harmful if swallowed. May cause irritation of the digestive tract.
   Inhalation
May cause respiratory tract irritation. May be harmful if inhaled.
   Skin
May be harmful if absorbed through the skin.
   Eyes
Causes eye irritation.

First aid
 
   Ingestion
Get medical aid. Wash mouth out with water.
   Inhalation
Remove from exposure to fresh air immediately.
   Skin
Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids.

Transport.
HS Code
2933 99 90