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