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CYANOGEN
(cylinder)
ICSC: 1390
Peer-Review Status: 17.10.2001 Validated
Dicyanogen
Ethanedinitrile
Oxalonitrile 
CAS #: 460-19-5 RTECS #: GT1925000
UN #: 1026
EC #: 608-011-00-8
EINECS #: 207-306-5
    Formula: C2N2
Molecular mass: 52.04

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Highly flammable. Gives off irritating or toxic fumes (or gases) in a fire.  NO open flames, NO sparks and NO smoking.  Shut off supply; if not possible and no risk to surroundings, let the fire burn itself out. In other cases extinguish with dry powder, carbon dioxide. 
EXPLOSION Gas/air mixtures are explosive. Risk of fire and explosion on contact with strong oxidizing agents.  Closed system, ventilation, explosion-proof electrical equipment and lighting.  In case of fire: keep cylinder cool by spraying with water. 
 
EXPOSURE   AVOID ALL CONTACT!  IN ALL CASES CONSULT A DOCTOR! 
Inhalation Convulsions. Cough. Dizziness. Headache. Laboured breathing. Sore throat. Unconciousness. Vomiting.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Half-upright position. Artificial respiration may be needed. No mouth-to-mouth artificial respiration. Refer for medical attention. See Notes. 
Skin ON CONTACT WITH LIQUID: FROSTBITE.  Cold-insulating gloves.  ON FROSTBITE: rinse with plenty of water, do NOT remove clothes. Refer for medical attention . 
Eyes Redness. Pain.  Wear face shield or eye protection in combination with breathing protection.  First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion      

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Evacuate danger area! Consult an expert! Personal protection: gas-tight chemical protection suit including self-contained breathing apparatus. Ventilation. Remove all ignition sources. NEVER direct water jet on liquid.   
EC Classification
Symbol: F, T, N; R: 11-23-50/53; S: (1/2)-23-45-60-61 
UN Classification
UN Hazard Class: 2.3; UN Subsidiary Risks: 2.1 
GHS Classification
 

EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-20G2TF.
NFPA Code: H4; F4; R2. 
Fireproof. Cool. 

IMPORTANT DATA
Physical State; Appearance
COLOURLESS GAS OR COMPRESSED LIQUEFIED GAS WITH CHARACTERISTIC ODOUR. 

Physical dangers
The gas is heavier than air and may travel along the ground; distant ignition possible. 

Chemical dangers
On combustion, forms toxic gases including hydrogen cyanide, carbon monoxide and nitrogen oxides. Reacts with strong oxidants. This generates fire and explosion hazard. Reacts with acids. This produces highly toxic gases such as hydrogen cyanide. 

Occupational exposure limits
TLV: 10ppm as TWA; (ACGIH 2008).
MAK: 5 ppm, 11 mg/m³; Peak limitation category: II(2); Pregnancy risk group: D; Skin absorption (H); (DFG 2008). 

Routes of exposure
The substance can be absorbed into the body by inhalation. 

Inhalation risk
A harmful concentration of this gas in the air will be reached very quickly on loss of containment. 

Effects of short-term exposure
The substance is irritating to the eyes and respiratory tract. Rapid evaporation of the liquid may cause frostbite. The substance may cause effects on the central nervous system. This may result in respiratory failure and collapse. Exposure far above the OEL could cause death. 

Effects of long-term or repeated exposure
 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Boiling point: -21.2°C
Melting point: -27.9°C
Relative density (water = 1): 0.95 (-21°C)
Solubility in water, ml/100ml at 20°C: 450
Relative vapour density (air = 1): 1.8
Flash point: Flammable gas
Explosive limits, vol% in air: 6.6-42.6
Octanol/water partition coefficient as log Pow: 0.07  
The substance is very toxic to aquatic organisms. 

NOTES
Specific treatment is necessary in case of poisoning with this substance; the appropriate means with instructions must be available.
The odour warning when the exposure limit value is exceeded is insufficient.
Turn leaking cylinder with the leak up to prevent escape of gas in liquid state.
Card has been partly updated in April 2005. See sections Occupational Exposure Limits, Emergency Response.
Card has been partially updated in February 2009: see Occupational Exposure Limits. 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004-2012
LEGAL NOTICE Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information.


    See Also:
       Toxicological Abbreviations