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PENTABORANE
ICSC: 0819
Peer-Review Status: 25.11.1998 Validated
Pentaboron nonahydride 
CAS #: 19624-22-7 RTECS #: RY8925000
UN #: 1380
EINECS #: 243-194-4
    Formula: B5H9
Molecular mass: 63.2

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Flammable. Gives off irritating or toxic fumes (or gases) in a fire.  NO open flames, NO sparks and NO smoking. NO contact with halogens, halogenated compounds or oxidizing agents.  Use carbon dioxide, special powder, dry sand. NO other agents. 
EXPLOSION Above 30°C explosive vapour/air mixtures may be formed.  Above 30°C use a closed system, ventilation and explosion-proof electrical equipment.  In case of fire: keep drums, etc., cool by spraying with water. NO direct contact with water. 
 
EXPOSURE   AVOID ALL CONTACT!   
Inhalation Nausea. Drowsiness. Headache. Dizziness. Convulsions. Unconciousness. Weakness.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Artificial respiration may be needed. Refer for medical attention. 
Skin MAY BE ABSORBED! Redness. See Inhalation.  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 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 See Inhalation.  Do not eat, drink, or smoke during work.  Rinse mouth. Induce vomiting (ONLY IN CONSCIOUS PERSONS!). Refer for medical attention . 

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Evacuate danger area! Consult an expert! Personal protection: complete protective clothing including self-contained breathing apparatus. Ventilation. Collect leaking liquid in sealable containers. Absorb remaining liquid in sand or inert absorbent. Then store and dispose of according to local regulations.  Unbreakable packaging.
Put breakable packaging into closed unbreakable container.
Do not transport with food and feedstuffs. 
EC Classification
 
UN Classification
UN Hazard Class: 4.2; UN Subsidiary Risks: 6.1; UN Pack Group: I 
GHS Classification
 

EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-42G11.
NFPA Code: H4; F4; R2. 
Fireproof. Separated from strong oxidants, halogens and food and feedstuffs. Cool. Dry. Keep under nitrogen atmosphere. 

IMPORTANT DATA
Physical State; Appearance
COLOURLESS LIQUID WITH PUNGENT ODOUR. 

Physical dangers
The vapour is heavier than air. 

Chemical dangers
Decomposes at 150°C. This produces boron and flammable gas (hydrogen - see ICSC 0001). Decomposes on burning. This produces toxic fumes of boron oxides. Reacts with halogens, halogenated compounds, oils, greases and oxidants. This generates fire and explosion hazard. Impure material ignites spontaneously in air. 

Occupational exposure limits
TLV: 0.005 ppm, 0.013 mg/m³ as TWA; 0.015 ppm, 0.039 mg/m³ as STEL; (ACGIH 1998).
MAK: 0.005 ppm, 0.013 mg/m³; Peak limitation category: II(2); (DFG 2007). 

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

Inhalation risk
A harmful contamination of the air can be reached very quickly on evaporation of this substance at 20°C. 

Effects of short-term exposure
The substance is severely irritating to the eyes, skin and respiratory tract. The substance may cause effects on the central nervous system and liver. This may result in convulsions, acidosis and liver impairment. Exposure above the OEL could cause death. The effects may be delayed. Medical observation is indicated. 

Effects of long-term or repeated exposure
 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Boiling point: 60°C
Melting point: -47°C
Relative density (water = 1): 0.6
Solubility in water: reaction
Vapour pressure, kPa at 20°C: 22.8
Relative vapour density (air = 1): 2.2
Relative density of the vapour/air-mixture at 20°C (air = 1): 1.3
Flash point: 30°C c.c.
Auto-ignition temperature: ~35°C
Explosive limits, vol% in air: 0.42-98 
 

NOTES
Reacts violently with fire extinguishing agents such as halons.
The symptoms of some effects do not become manifest until up to 48 hours later.
The odour warning when the exposure limit value is exceeded is insufficient.
Do NOT take working clothes home.
Card has been partially updated in March 2008: 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