Dicyandiamide

  • Cyanoguanidine
  • Dicyanodiamide
  • Dicyanediamide
Formula
NCNHC(=NH)NH2
Structure
Description
Monoclinic prismatic crystals from water or alcohol. Odorless.
Uses
stabilizer of ammonium dinitramide melt

Registry Numbers and Inventories.
CAS
461-58-5
EC (EINECS/ELINCS)
207-312-8
S 22 24/25
RTECS
ME9950000
RTECS class
Other
Merck
13,3119
Beilstein/Gmelin
605637
Beilstein Reference
4-03-00-00160
EPA OPP
128921
Swiss Giftliste 1
G-4417
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C2H4N4
Formula mass
84.08
Boiling point, °C
143
Vapor pressure, mmHg
5.5 (25 C)
Density
1.404 g/cm3
Solubility in water
41.3 g/L
pKa/pKb
12.02 (pKb)
Partition coefficient, pKow
-1.64
Heat of vaporization
38.0 kJ/mol
Heat of combustion
-1376 kJ/mol

Hazards and Protection.
Storage
Keep container closed when not in use. Store in a cool, dry area away from incompatible substances.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Avoid ingestion and inhalation.
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 and clothing to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.
Small spills/leaks
Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions. Provide ventilation.
Disposal code
3
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents, strong acids, strong bases, ammonium nitrate, potassium chlorates.
Decomposition
Hydrogen cyanide, nitrogen oxides, carbon monoxide, carbon dioxide, cyanide fumes, ammonia.

Fire.
Flash Point,°C
40
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. Dust can be an explosion hazard when exposed to heat or flame. To extinguish fire use water spray, dry chemical, carbon dioxide, or appropriate foam.
Health
1
 
Flammability
0
 
 
Reactivity
1
 

Health.
Poison_Class
5
Exposure effects
Absorption into the body leads to the formation of methemoglobin which in sufficient concentrations causes cyanosis. Prolonged or repeated contact may cause possible eczema. Effects may be delayed 2-4 hours or longer.
   Ingestion
May cause gastrointestinal irritation with nausea, vomiting and diarrhea. May be harmful if swallowed. May form methemoglobin which in sufficient concentration causes cyanosis.
   Inhalation
May cause respiratory tract irritation. May cause irritation of the mucous membranes.
   Skin
May cause skin irritation. Lon-term exposure may cause eczema.
   Eyes
May cause eye irritation.

First aid
 
   Ingestion
Never give anything by mouth to an unconscious person. Get medical aid immediately. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.
   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.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
HS Code
2926 20 00