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Sunday, 07 August 2011 06:28

Halogens & Their Compounds: Physical & Chemical Hazards

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Chemical Name
CAS-Number

Physical

Chemical

UN Class or Division /  Subsidiary Risks

BROMINE
7726-95-6

The vapour is heavier than air

Upon heating, toxic fumes are formed • The substance is a strong oxidant and reacts violently with combustible and reducing materials • Reacts violently with aqueous ammonia, oxidants, metals, organic compounds and phosphorus causing fire and explosion hazard • Attacks some forms of plastic, rubber and coatings

3/ 6.1

BROMINE PENTAFLUORIDE
7789-30-2

The vapour is heavier than air

The substance decomposes on heating above 460 °C and on contact with acid or acid fumes producing very toxic fumes of fluorine and bromine • Reacts violently with fuels and organic compounds, hydrogen containing material (such as ammonia, acetic acid, grease, paper) causing fire and explosion hazard • Reacts explosively with water or steam to produce toxic and corrosive fumes • Reacts with all known elements, except nitrogen, oxygen and rare gases

5.1/ 6.1/ 8

CARBONYL FLUORIDE
353-50-4

The gas is heavier than air

The substance decomposes on heating at 450-490 °C producing toxic gases • Hydrolyzed rapidly by water to form carbon dioxide and hydrogen fluoride

2.3/ 8

CHLORINE
7782-50-5

The gas is heavier than air

Reacts violently with many organic compounds, ammonia and finely divided metals causing fire and explosion hazard • Attacks many metals in presence of water • Attacks plastic, rubber and coatings

2.3/ 5.1/ 8

CHLORINE OXIDE
10049-04-4

The gas is heavier than air

May explosively decompose on shock, friction, or concussion • May explode on heating • The substance is a strong oxidant and reacts violently with combustible and reducing materials • Reacts violently with mercury, phosphorus, sulphur and many compounds, causing fire and explosion hazard • Reacts with water producing hydrochloric acid and chloric acid

CHLORINE TRIFLUORIDE
7790-91-2

The gas is heavier than air and corrosive

The substance decomposes above 220 °C producing toxic gases (chlorine and fluorine compounds) • Reacts violently with water, sand, silicon-containing compounds, glass, and asbestos • Reacts with all forms of plastics, rubber, and resins, except the highly fluorinated polymers • Most combustible materials ignite spontaneously on contact with this substance • Reacts violently with oxidizable materials, metals and metal oxides • Explodes in contact with organic materials • Emits highly toxic fumes on contact with acids

2.3/ 5.1/ 8

FLUORINE
7782-41-4

The gas is heavier than air

The substance is a strong oxidant and reacts violently with combustible and reducing materials • Reacts violently with water producing toxic and corrosive vapours: ozone and hydrogen fluoride • Reacts violently with ammonia, metals, oxidants, and many other materials, causing fire and explosion hazard

2.3/ 5.1/ 8

HYDROGEN BROMIDE
10035-10-6

The gas is heavier than air

The solution in water is a strong acid, it reacts violently with bases and is corrosive • Reacts violently with strong oxidants and many organic compounds causing fire and explosion hazard • Attacks many metals forming flammable hydrogen gas

8

HYDROGEN FLUORIDE
7664-39-3

The solution in water is a strong acid, it reacts violently with bases and is corrosive • Reacts violently with many compounds causing fire and explosion hazard • On contact with air it emits corrosive fumes which are heavier than air and will spread along the ground • Attacks glass and other silicon-containing compounds

3/ 6.1

NITROGEN TRIFLUORIDE
7783-54-2

2.3/ 5.1

OXYGEN DIFLUORIDE
7783-41-7

The gas is heavier than air

The substance decomposes on heating above 250 °C producing toxic fumes (fluorine) • The substance is a strong oxidant and reacts violently with combustible and reducing materials • Reacts explosively with hydrogen sulfide at ambient temperature, with chlorine, bromine or iodine on warming • Attacks mercury • Explodes on contact with steam • Reaction of oxygen difluoride with non-metals such as red phosphorous and boron powder and silica, alumina or similar surface-active solids is exothermic and may be explosive

2.3/ 5.1/ 8

PERCHLORYL FLUORIDE
7616-94-6

The substance decomposes on heating producing toxic fumes (fluorine, fluorine oxides, chlorine, chlorine oxides) • The substance is a strong oxidant and reacts violently with combustible and reducing materials, causing fire and explosion hazard • Attacks some forms of plastics, rubber and coatings

2.3/ 5.1

PHOSGENE
75-44-5

The vapour is heavier than air and may travel along the ground

The substance decomposes on heating above 300 °C, producing toxic and corrosive gases: hydrogen chloride and carbon monoxide, chlorine fumes • Reacts violently with strong oxidants • Reacts slowly with water producing corrosive, pungent and toxic gases • Reacts violently with amines, with aluminium • Attacks many metals in presence of water • Attacks metal, plastic, rubber

2.3/ 8

PHOSPHORUS PENTABROMIDE
7789-69-7

8

PHOSPHOROUS TRIBROMIDE
7789-60-8

8

SULPHUR CHLORIDE
10025-67-9

On combustion, forms toxic gases and vapours (such as hydrogen chloride, sulphur dioxide, hydrogen sulfide) • The substance decomposes to toxic chlorine gas and solid sulphur on heating above 300 °C • Reacts with peroxides, oxides of phosphorous and some organic compounds, causing fire and explosion hazard • Reacts with moist air to form corrosive vapours (hydrochloric acid) • Contact with water causes a violent reaction, forming hydrogen chloride gas (or hydrochloric acid), sulphur dioxide, sulphur, sulfite, thiosulfate and hydrogen sulfide, which may corrode metal containers and form flammable hydrogen gas

8

SULPHUR DICHLORIDE
10545-99-0

8

SULPHUR HEXAFLUORIDE
2551-62-4

The gas is heavier than air and may accumulate in low ceiling spaces causing deficiency of oxygen

The substance decomposes in a fire producing toxic fumes of sulphur oxides and hydrogen fluoride • on contact with hot surfaces producing S02 • Upon heating, toxic fumes are formed • Reacts with strong oxidants and alkali and earth alkali

2.2

SULFURYL FLUORIDE
2699-79-8

2.3

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