ICSC 0661 - HYDROXYLAMINE

[List of Chemicals] [Risk Notes] [Risk Phrases] [Safety Phrases] [Danger Symbols]

HYDROXYLAMINE

ICSC: 0661
_{October 1995}

Oxammonium

CAS No: 7803-49-8
RTECS No: NC2975000
EC No: 612-122-00-7

H₃NO / NH₂OH
Molecular mass: 33.0

TYPES OF HAZARD / EXPOSURE	ACUTE HAZARDS / SYMPTOMS	PREVENTION	FIRST AID / FIRE FIGHTING
FIRE	Explodes on heating. Gives off irritating or toxic fumes (or gases) in a fire.	NO open flames, NO sparks, and NO smoking. NO contact with hot surfaces.	Water in large amounts, alcohol-resistant foam, powder.
EXPLOSION	Risk of fire and explosion on contact with many substances (see Chemicals 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 or finger nails. Blue skin. Cough. Dizziness. Headache. Sore throat. Weakness.	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.	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 take to a doctor.
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: P2 filter respirator for harmful particles. Sweep spilled substance into sealable containers; if appropriate, moisten first to prevent dusting. Carefully collect remainder, then remove to safe place.	Xn Symbol N Symbol R: 5-22-37/38-41-43-48/22-50 S: (2-)22-26-36/37/39-61

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.

Chemical dangers
May explode on heating above 70°C or when exposed to open flame. The substance decomposes rapidly at room temperature, especially in presence of moisture and carbon dioxide, and violently on heating producing 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 causing 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 in which a harmful concentration in the air is reached on evaporation of this substance at 20°C.

Effects of short-term exposure
The substance is irritating to the skin and the respiratory tract, and is corrosive to the eyes. The substance may cause effects on the blood, resulting 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, resulting in formation of methaemoglobin and the consequent anaemia.

PHYSICAL PROPERTIES

ENVIRONMENTAL DATA

Decomposes below boiling point at <70°C
Melting point: 33°C
Relative density (water = 1): 1.2
Solubility in water, g/100 ml 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.

IPCS
International
Programme on
Chemical Safety

Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004

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