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PENTABORANEICSC: 0819
Pentaboron nonahydrideNovember 1998
CAS #: 19624-22-7
UN #: 1380
EC Number: 243-194-4

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Flammable. Gives off irritating or toxic fumes (or gases) in a fire.  Above 30°C explosive vapour/air mixtures may be formed.  NO open flames, NO sparks and NO smoking. NO contact with halogens, halogenated compounds or oxidizing agents.  Above 30°C use a closed system, ventilation and explosion-proof electrical equipment.  Use carbon dioxide, special powder, dry sand. NO other agents.  In case of fire: keep drums, etc., cool by spraying with water. NO direct contact with water. 

 AVOID ALL CONTACT!  
  SYMPTOMS PREVENTION FIRST AID
Inhalation Nausea. Drowsiness. Headache. Dizziness. Convulsions. Unconsciousness. Weakness. Symptoms may be delayed. See Notes.  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 CLASSIFICATION & 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. 

According to UN GHS Criteria

 

Transportation
UN Classification
UN Hazard Class: 4.2; UN Subsidiary Risks: 6.1; UN Pack Group: I 

STORAGE
Fireproof. Separated from strong oxidants, halogens and food and feedstuffs. Cool. Dry. Keep under nitrogen atmosphere. 
PACKAGING
Unbreakable packaging.
Put breakable packaging into closed unbreakable container.
Do not transport with food and feedstuffs. 
PENTABORANE ICSC: 0819
PHYSICAL & CHEMICAL INFORMATION

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. 

Formula: B5H9
Molecular mass: 63.2
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 


EXPOSURE & HEALTH EFFECTS

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

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. 

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

Effects of long-term or repeated exposure
 


OCCUPATIONAL EXPOSURE LIMITS
TLV: 0.005 ppm as TWA; 0.015 ppm as STEL.
MAK: 0.013 mg/m3, 0.005 ppm; peak limitation category: II(2) 

ENVIRONMENT
 

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. 

ADDITIONAL INFORMATION
  EC Classification
 

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       Toxicological Abbreviations