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DIBORANE
(liquefied, cooled) (cylinder)
ICSC: 0432
Peer-Review Status: 07.04.2006 Validated
Boroethane
Boron hydride
Diboron hexahydride 
CAS #: 19287-45-7 RTECS #: HQ9275000
UN #: 1911
EINECS #: 242-940-6
    Formula: B2H6/BH3BH3
Molecular mass: 27.7

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Extremely flammable.  NO open flames, NO sparks and NO smoking. NO contact with halogens, oxidizing agents or water. NO contact with hot surfaces.  Shut off supply; if not possible and no risk to surroundings, let the fire burn itself out. In other cases extinguish with dry powder. NO hydrous agents. 
EXPLOSION Gas/air mixtures are explosive. Risk of explosion on contact with water.  Closed system, ventilation, explosion-proof electrical equipment and lighting. Prevent build-up of electrostatic charges (e.g., by grounding). Use non-sparking handtools.  In case of fire: keep cylinder cool by spraying with water. NO direct contact with water. Combat fire from a sheltered position. 
 
EXPOSURE   STRICT HYGIENE!  IN ALL CASES CONSULT A DOCTOR! 
Inhalation Cough. Sore throat. Nausea. Laboured breathing. Dizziness. Weakness. Headache. Fever. Tremor. Symptoms may be delayed. See Notes.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer for medical attention. 
Skin Frostbite. Frostbite.  Cold-insulating gloves.  ON FROSTBITE: rinse with plenty of water, do NOT remove clothes. Refer for medical attention . 
Eyes Severe deep burns.  Wear safety goggles 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   Do not eat, drink, or smoke during work.   

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Evacuate danger area! Consult an expert! Personal protection: complete protective clothing including self-contained breathing apparatus. Ventilation. Remove all ignition sources. Turn off gas at source if possible.  Special insulated cylinder.
Do not transport with food and feedstuffs. 
EC Classification
 
UN Classification
UN Hazard Class: 2.3; UN Subsidiary Risks: 2.1 
GHS Classification
Signal: Danger
Extremely flammable gas
Contains gas under pressure; may explode if heated
Fatal if inhaled
Causes severe skin burns and eye damage
Causes damage to respiratory system if if inhaled 
flam;flamecylinder;gasskull;toxiccorrcancer;health haz

EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-20S1911.
NFPA Code: H4; F4; R4; W. 
Fireproof. Separated from strong oxidants, food and feedstuffs and water. Cool. Ventilation along the floor and ceiling. Dry. 

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

Physical dangers
The gas mixes well with air, explosive mixtures are easily formed. 

Chemical dangers
The substance polymerizes. This produces liquid pentaborane. Reacts violently with oxidants. Decomposes rapidly on heating. This produces hydrogen, boric acid and boric oxide. 

Occupational exposure limits
TLV (NOT-ESTABLISHED):. 

Routes of exposure
The substance can be absorbed into the body by inhalation. Serious local effects on contact with skin. 

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 corrosive to the eyes, skin and respiratory tract. Inhalation may cause lung oedema. See Notes. The effects may be delayed. Exposure could cause death. 

Effects of long-term or repeated exposure
Inhalation may cause asthma-like reactions (RADS). 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Boiling point: -92°C
Melting point: -165°C
Solubility in water: hydrolyzes to hydrogen and boric acid
Vapour pressure, kPa at 25°C:
Relative vapour density (air = 1): 0.96
Flash point: Flammable gas
Auto-ignition temperature: 40-50°C
See Notes.
Explosive limits, vol% in air: 0.8-88 
 

NOTES
The presence of contaminants may lower the auto-ignition temperature so that ignition may occur at or below room temperature.
Reacts violently with fire extinguishing agents such as water.
Environmental effects from the substance have not been investigated.
The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort.
Rest and medical observation is therefore essential.
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. 

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
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    See Also:
       Toxicological Abbreviations