ICSC 0432 - DIBORANE

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DIBORANE	ICSC: 0432 (April 2006)
Boroethane Boron hydride Diboron hexahydride

CAS #: 19287-45-7

UN #: 1911

EC Number: 242-940-6

	ACUTE HAZARDS	PREVENTION	FIRE FIGHTING
FIRE & EXPLOSION	Extremely flammable. Gas/air mixtures are explosive. Risk of explosion on contact with water.	NO open flames, NO sparks and NO smoking. NO contact with halogens, oxidizing agents or water. NO contact with hot surfaces. Closed system, ventilation, explosion-proof electrical equipment and lighting. Prevent build-up of electrostatic charges (e.g., by grounding). Use non-sparking handtools.	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. In case of fire: keep cylinder cool by spraying with water. NO direct contact with water. Combat fire from a sheltered position.

STRICT HYGIENE! IN ALL CASES CONSULT A DOCTOR!
	SYMPTOMS	PREVENTION	FIRST AID
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	CLASSIFICATION & 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.	According to UN GHS Criteria 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 inhaled Transportation UN Classification UN Hazard Class: 2.3; UN Subsidiary Risks: 2.1
STORAGE
Fireproof. Separated from strong oxidants, food and feedstuffs and water. Cool. Ventilation along the floor and ceiling. Dry.
PACKAGING
Special insulated cylinder. Do not transport with food and feedstuffs.

DIBORANE

ICSC: 0432

PHYSICAL & CHEMICAL INFORMATION
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.	Formula: B₂H₆/BH₃BH₃ Molecular mass: 27.7 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

PHYSICAL & CHEMICAL INFORMATION

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.

Formula: B₂H₆/BH₃BH₃
Molecular mass: 27.7
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

EXPOSURE & HEALTH EFFECTS
Routes of exposure The substance can be absorbed into the body by inhalation. Serious local effects on contact with skin. 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.	Inhalation risk A harmful concentration of this gas in the air will be reached very quickly on loss of containment. Effects of long-term or repeated exposure Inhalation may cause asthma-like reactions (RADS).

EXPOSURE & HEALTH EFFECTS

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

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.

Inhalation risk
A harmful concentration of this gas in the air will be reached very quickly on loss of containment.

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

OCCUPATIONAL EXPOSURE LIMITS
TLV: 0.1 ppm as TWA

ENVIRONMENT
Environmental effects from the substance have not been investigated adequately.

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. 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 are 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.

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.
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 are 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

EC Classification

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