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HYDROXYLAMINE
ICSC: 0661
Peer-Review Status: 27.10.1995 Validated
Oxammonium 
CAS #: 7803-49-8 RTECS #: NC2975000
EC #: 612-122-00-7
EINECS #: 232-259-2
    Formula: H3NO / NH2OH
Molecular mass: 33.0

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Gives off irritating or toxic fumes (or gases) in a fire.  NO open flames, NO sparks and NO smoking. NO contact with hot surfaces.  Use water in large amounts, alcohol-resistant foam, powder. 
EXPLOSION Risk of fire and explosion on contact with many substances. Risk of explosion on heating. See Chemical Dangers.    In case of fire: keep drums, etc., cool by spraying with water. Combat fire from a sheltered position. 
 
EXPOSURE   AVOID ALL CONTACT!   
Inhalation Blue lips, fingernails and skin. Cough. Dizziness. Headache. Sore throat. Weakness.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Refer for medical attention. See Notes. 
Skin MAY BE ABSORBED! Redness. Pain. Further see Inhalation.  Protective gloves. Protective clothing.  Remove contaminated clothes. Rinse and then wash skin with water and soap. Refer for medical attention . 
Eyes Redness. Pain. Severe deep burns.  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 Nausea. Shortness of breath. Vomiting. See Notes. Further see Inhalation.  Do not eat, drink, or smoke during work.  Rinse mouth. Refer for medical attention . See Notes. 

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Sweep spilled substance into covered sealable containers. If appropriate, moisten first to prevent dusting. Carefully collect remainder. Then store and dispose of according to local regulations.   
EC Classification
Symbol: Xn, N; R: 5-22-37/38-41-43-48/22-50; S: (2)-22-26-36/37/39-61 
UN Classification
 
GHS Classification
 

EMERGENCY RESPONSE SAFE STORAGE
NFPA Code: H2; F0; R3.  Fireproof. Separated from incompatible materials. See Chemical Dangers. Cool. Dry. Well closed. 

IMPORTANT DATA
Physical State; Appearance
VERY HYGROSCOPIC WHITE NEEDLES OR FLAKES. 

Physical dangers
 

Chemical dangers
May explode on heating above 70°C or when exposed to open flame. Decomposes rapidly at room temperature, especially in the presence of moisture and carbon dioxide, and violently on heating. This produces toxic fumes including nitrogen oxides. The solution in water is a weak base. Reacts violently with oxidants, metals such as finely divided zinc, some metal oxides, copper(II)sulfate and phosphorus chlorides. This generates fire and explosion hazard. 

Occupational exposure limits
TLV (NOT-ESTABLISHED):.
MAK: Sensitization of skin (SH); (DFG 2005). 

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

Inhalation risk
No indication can be given about the rate at which a harmful concentration of this substance in the air is reached on evaporation at 20°C. 

Effects of short-term exposure
The substance is corrosive to the eyes. The substance is irritating to the skin and respiratory tract. The substance may cause effects on the blood. This may result in formation of methaemoglobin. The effects may be delayed. Medical observation is indicated. 

Effects of long-term or repeated exposure
Repeated or prolonged contact may cause skin sensitization. The substance may have effects on the blood. This may result in formation of methaemoglobin and consequent anaemia. 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Decomposes at <70°C
Melting point: 33°C
Relative density (water = 1): 1.2
Solubility in water at 20°C: good
Vapour pressure, kPa at 47°C: 1.3
Relative vapour density (air = 1): 1.1
Relative density of the vapour/air-mixture at 20°C (air = 1): 1.00
Flash point: explodes at 129°C
Auto-ignition temperature: 265°C
Octanol/water partition coefficient as log Pow: -1.5  
The substance is very toxic to aquatic organisms. 

NOTES
Depending on the degree of exposure, periodic medical examination is indicated.
The symptoms of nausea, vomiting and cyanosis do not become manifest until several hours have past.
Specific treatment is necessary in case of poisoning with this substance; the appropriate means with instructions must be available.
The relation between odour and the occupational exposure limit cannot be indicated.
Decomposition during storage may cause a build-up of pressure in the container.
Also consult ICSC # 0709 Hydroxylamine hydrochloride.
Card has been partly updated in October 2005.
See sections Occupational Exposure Limits, EU classification. 

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