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NIOSH

PENTABORANE

ICSC: 0819

Pentaboron nonahydride
B5H9
Molecular mass: 63.2
ICSC # 0819 		CAS # 19624-22-7
RTECS # RY8925000
UN # 1380
November 25, 1998 Validated

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 and oxidizers.
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: cool drums, etc., by spraying with water but avoid contact of the substance with water.
EXPOSURE
AVOID ALL CONTACT!

•INHALATION Nausea. Drowsiness. Headache. Dizziness. Convulsions. Unconsciousness. Weakness. Symptoms may be delayed (see Notes).
Ventilation, local exhaust, or breathing protection.
Fresh air, rest. Artificial respiration if indicated. 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.
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 (See Inhalation).
Do not eat, drink, or smoke during work.
Rinse mouth. Induce vomiting (ONLY IN CONSCIOUS PERSONS!). Refer for medical attention.

SPILLAGE DISPOSAL

STORAGE

PACKAGING & LABELLING

Evacuate danger area! Consult an expert! Ventilation. Collect leaking and spilled liquid in sealable containers as far as possible. Absorb remaining liquid in sand or inert absorbent and remove to safe place. (Extra personal protection: complete protective clothing including self-contained breathing apparatus).
Fireproof. Separated from strong oxidants, food and feedstuffs, halogens. Cool. Dry. Under nitrogen atmosphere.
Unbreakable packaging; put breakable packaging into closed unbreakable container. Do not transport with food and feedstuffs.
UN Hazard Class: 4.2
UN Subsidiary Risks: 6.1
UN Packing Group: I
ICSC: 0819 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities (C) IPCS CEC 1994. No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.

PENTABORANE

ICSC: 0819

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PHYSICAL STATE; APPEARANCE:
COLOURLESS LIQUID , WITH PUNGENT ODOUR.

PHYSICAL DANGERS:
The vapour is heavier than air.

CHEMICAL DANGERS:
The substance decomposes slowly on heating to 150°C to form boron and the flammable gas hydrogen - see ICSC 0001, and on burning producing toxic fumes (boron oxides). Reacts with halogens, halogenated compounds, oils and greases, and oxidants causing 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).
OSHA PEL†: TWA 0.005 ppm (0.01 mg/m3)
NIOSH REL: TWA 0.005 ppm (0.01 mg/m3) ST 0.015 ppm (0.03 mg/m3)
NIOSH IDLH: 1 ppm See: 19624227


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 severely irritates the eyes, the skin and the respiratory tract. The substance may cause effects on the central nervous system and liver , resulting in convulsions, acidosis and liver impairment. Exposure above the OEL may result in death. The effects may be delayed. Medical observation is indicated.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:

PHYSICAL
PROPERTIES

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: approx. 35°C
Explosive limits, vol% in air: 0.42-98

ENVIRONMENTAL
DATA


N O T E S

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.
Transport Emergency Card: TEC (R)-42G11

NFPA Code: H4; F4; R2;
Card has been partially updated in March 2008: see Occupational Exposure Limits.

ADDITIONAL INFORMATION



ICSC: 0819 PENTABORANE
(C) IPCS, CEC, 1994
IMPORTANT LEGAL NOTICE: Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH, the CEC or the IPCS is responsible for the use which might be made of this information. This card contains the collective views of the IPCS Peer Review Committee and may not reflect in all cases all the detailed requirements included in national legislation on the subject. The user should verify compliance of the cards with the relevant legislation in the country of use. The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.
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