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Sunday, 07 August 2011 00:46

Boranes: Physical & Chemical Hazards

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Chemical Name

CAS-Number

Physical

Chemical

UN Class or Division / Subsidiary RisksChemical

BORON OXIDE
1303-86-2

Reacts slowly with water to form boric acid • Corrosive to metals in the presence of oxygen

8

BORON TRIBROMIDE
10294-33-4

The vapour is heavier than air

May explode on heating • The substance decomposes on contact with alcohol producing toxic and corrosive fumes (hydrogen bromide) • The solution in water is a strong acid, it reacts violently with bases and is corrosive to metals, rubber and wood • Reacts violently with water producing hydrogen gas, causing explosion hazard

2.3/ 8

BORON TRICHLORIDE
10294-34-5

The gas is heavier than air

Reacts violently with water • On contact with air it emits hydrogen chloride • Attacks many metals in presence of water

2.3/ 8

BORON TRIFLUORIDE
7637-07-2

The gas is heavier than air

The substance will polymerize unsaturated compounds • The substance decomposes on contact with water and moisture, producing toxic and corrosive fumes including hydrogen fluoride, fluoroboric acid and boric acid • Reacts violently with metals such as sodium, potassium and calcium, and with alkyl nitrates • Attacks many metals in presence of water

8/ 3

BORON TRIFLUORIDE ETHERATE
109-63-7

4.1/ 6.1

DECABORANE
17702-41-9

Dust explosion possible if in powder or granular form, mixed with air

May explode on heating or contact with flames • The substance decomposes slowly on heating to 300°C to form boron and the flammable gas, hydrogen, and on burning producing toxic fumes (boron oxides) • Reacts with halogenated materials and ethers to form impact-sensitive materials • Undergoes explosive reaction with oxidants • Reacts with water or moisture to form flammable gas • Attacks natural rubber, some synthetic rubbers, some greases and some lubricants • Ignites in oxygen at 100°C • Reacts with amides, acetone, butyraldehyde, acetonitrile at room temperature

2.3/ 2.1

DIBORANE
19287-45-7

The gas mixes well with air, explosive mixtures are easily formed • Will ignite spontaneously in moist air at room temperature

The substance will polymerize to form liquid pentaborane • The substance decomposes at red heat to boron and hydrogen, and at lower temperatures to hydrogen and boron hydrides • Reacts spontaneously with chlorine and forms hydrides with aluminum and lithium which may ignite spontaneously in air • Reacts with many oxidized surfaces as a strong reducing agent

4.2/ 6.1

PENTABORANE
19624-22-7

The vapour is heavier than air

The substance decomposes slowly on heating to 150°C to form boron and the flammable gas hydrogen, and on burning producing toxic fumes (boron oxides) • Reacts with oxidants and halogens causing fire and explosion hazard • Impure material ignites spontaneously in air • Shock-sensitive solutions are formed with solvents such as ketones, ethers, esters

4.3

SODIUM BOROHYDRIDE
16940-66-2

SODIUM TETRABORATE DECAHYDRATE
1303-96-4

The substance decomposes on heating above 400°C producing metaborates • The substance is a weak base

3

TRIMETHYL BORATE
121-43-7

The vapour is heavier than air and may travel along the ground; distant ignition possible

On combustion, forms toxic gases of carbon and boron oxides • Reacts with oxidants causing fire and explosion hazard • Reacts with water, moist air and acids to form methanol and boric acid

For UN Class: 1.5 = very insensitive substances which have a mass explosion hazard; 2.1 = flammable gas; 2.3 = toxic gas; 3 = flammable liquid; 4.1 = flammable solid; 4.2 = substance liable to spontaneous combustion; 4.3 = substance which in contact with water emits flammable gases; 5.1 = oxidizing substance; 6.1 = toxic; 7 = radioactive; 8 = corrosive substance

 

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Contents

Preface
Part I. The Body
Part II. Health Care
Part III. Management & Policy
Part IV. Tools and Approaches
Part V. Psychosocial and Organizational Factors
Part VI. General Hazards
Part VII. The Environment
Part VIII. Accidents and Safety Management
Part IX. Chemicals
Part X. Industries Based on Biological Resources
Part XI. Industries Based on Natural Resources
Part XII. Chemical Industries
Part XIII. Manufacturing Industries
Part XIV. Textile and Apparel Industries
Part XV. Transport Industries
Part XVI. Construction
Part XVII. Services and Trade
Part XVIII. Guides