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CYANAMIDE
ICSC: 0424
Peer-Review Status: 23.11.2007 Validated
Carbamonitrile
Hydrogen cyanamide
Carbodiimide
Carbimide
Cyanogenamide
Amidocyanogen 
CAS #: 420-04-2 RTECS #: GS5950000
UN #: 2811
EC #: 615-013-00-2
EINECS #: 206-992-3
    Formula: CH2N2 / H2NCN
Molecular mass: 42.0

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Combustible only at increased temperature. Gives off irritating or toxic fumes (or gases) in a fire.  NO open flames.  Use carbon dioxide, dry powder, dry sand, water spray. 
EXPLOSION     Combat fire from a sheltered position. 
 
EXPOSURE   PREVENT DISPERSION OF DUST! AVOID ALL CONTACT!  IN ALL CASES CONSULT A DOCTOR! 
Inhalation Cough. Shortness of breath.  Use local exhaust or breathing protection.  Fresh air, rest. Seek medical attention if you feel unwell. 
Skin MAY BE ABSORBED! Redness. Pain.  Protective gloves. Protective clothing.  Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention . 
Eyes Redness. Pain.  Wear face shield.  First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion Burning sensation. Sore throat. Abdominal pain.  Do not eat, drink, or smoke during work. Wash hands before eating.  Rinse mouth. Give one or two glasses of water to drink. Do NOT induce vomiting. Refer for medical attention . 

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Personal protection: complete protective clothing including self-contained breathing apparatus. Do NOT let this chemical enter the environment. Vacuum spilled material with specialist equipment. Carefully collect remainder. Then store and dispose of according to local regulations.  Airtight.
Do not transport with food and feedstuffs. 
EC Classification
Symbol: T; R: 21-25-36/38-43; S: (1/2)-3-22-36/37-45 
UN Classification
UN Hazard Class: 6.1; UN Pack Group: III 
GHS Classification
Signal: Danger
Toxic if swallowed
Fatal in contact with skin
Causes skin irritation
Causes serious eye irritation
May cause allergic skin reaction
Suspected of damaging fertility or the unborn child
Toxic to aquatic life 
skull;toxiccancer;health haz

EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-61GT1-III.
NFPA Code: H4; F1; R3. 
Separated from food and feedstuffs and incompatible materials. See Chemical Dangers. Cool. Store at maximum 20 °C, never exceed 30 °C. Dry. Well closed. Keep in a well-ventilated room. Store only if stabilized. See Notes. Store in stainless steel, polyethylene or polypropylene. 

IMPORTANT DATA
Physical State; Appearance
COLOURLESS HYGROSCOPIC DELIQUESCENT CRYSTALS. 

Physical dangers
No data. 

Chemical dangers
The substance is a highly reactive compound. May explode on vacuum distillation. The substance may spontaneously polymerize. Dimerizes at temperatures above 40°C with strong heat release. Dimerization is catalyzed by traces of bases. Decomposes on contact with acids, bases or moisture. This produces toxic fumes including ammonia, nitrogen oxides and cyanides. Reacts with acids, strong oxidants and strong reducing agents. This generates explosion and toxic hazard. Attacks metals such as steel, copper and aluminium. 

Occupational exposure limits
TLV: 2mg/m³ as TWA; (ACGIH 2007). 

Routes of exposure
The substance can be absorbed into the body by inhalation of its aerosol, through the skin and by ingestion. 

Inhalation risk
A harmful concentration of airborne particles can be reached quickly when dispersed, especially if powdered. 

Effects of short-term exposure
The substance is severely irritating to the eyes and skin. The substance is irritating to the respiratory tract. See Notes. 

Effects of long-term or repeated exposure
Repeated or prolonged contact may cause skin sensitization. Animal tests show that this substance possibly causes toxicity to human reproduction or development. 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Boiling point at 0.067kPa: 83°C
Melting point: 44°C
Decomposes at 260°C
Relative density (water = 1): 1.28
Solubility in water, g/100ml at 25°C: 85
Vapour pressure, Pa at 20°C: 0.5
Flash point: 141°C
Heat of solution in water: 359 J/g (Strongly cools down when dissolved in water.) 
The substance is toxic to aquatic organisms. It is strongly advised not to let the chemical enter into the environment. 

NOTES
Cyanamide has to be stabilized by pH-buffer against dimerization and decomposition.
An added stabilizer or inhibitor can influence the toxicological properties of this substance, consult an expert.
Cyanamide that has been stored for a long time or is contaminated, should be diluted with at least three times its volume of water to avoid critical decomposition temperatures being reached.
Do NOT take working clothes home.
Term cyanamide is also used to designate calcium cyanamide.
In combination with even small amounts of alcohol the substance causes effects on cardiovascular and central nervous systems resulting in flushing, palpitation, hypotension and hyperventilation. 

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