Chemical Name
CAS-Number

Physical

Chemical

UN Class or Division /  Subsidiary Risks

CATECHOL
120-80-9

On combustion, forms acrid and irritating fumes • Reacts with oxidants

p-CHLORO-m-CRESOL
59-50-7

6.1

2-CHLOROPHENOL
95-57-8

The vapour is heavier than air

The substance decomposes on heating producing toxic and corrosive fumes (hydrochloric acid, chlorine) • Reacts with oxidants

6.1

3-CHLOROPHENOL
108-43-0

The substance decomposes on heating producing toxic and corrosive fumes (hydrochloric acid, chlorine) • Reacts with oxidants

4-CHLOROPHENOL
106-48-9

The vapour is heavier than air

The substance decomposes on heating producing toxic and corrosive fumes (hydrochloric acid, chlorine) • Reacts with oxidants

6.1

CRESOL, ALL ISOMERS
1319-77-3

The substance decomposes on heating producing strong acids and bases, causing fire and explosion hazard • Attacks many metals

6.1/ 8

o-CRESOL
95-48-7

On combustion, forms toxic fumes • Reacts violently with strong oxidizing agents, causing fire and explosion hazard • Easily oxidized on exposure to air

6.1/ 8

m-CRESOL
108-39-4

The substance decomposes on burning producing toxic and irritating fumes • Reacts with strong oxidants

6.1/ 8

p-CRESOL
106-44-5

On combustion, forms toxic fumes • Reacts violently with strong oxidizing agents, causing fire and explosion hazard

6.1/ 8

2,6-DI-tert-BUTYL-p-CRESOL
128-37-0

The substance decomposes on heating and on contact with oxidizing materials

2,4-DICHLOROPHENOL
120-83-2

The vapour is heavier than air

On combustion, forms corrosive gas (hydrogen chloride) • Reacts violently with strong oxidants • Gives off toxic fumes in a fire

6.1

2,5-DICHLOROPHENOL
583-78-8

The substance decomposes on burning producing irritating and poisonous gases • Reacts with oxidants, acid chlorides, acid anhydrides

6.1

3,5-DICHLOROPHENOL
591-35-5

The substance decomposes on burning producing irritating and poisonous gases, acid chlorides, acid anhydrides • Reacts with oxidants

6.1

2,4-DIMETHYLPHENOL
105-67-9

6.1

DINITRO-o-CRESOL
534-52-1

6.1

HYDROQUINONE
123-31-9

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

Reacts violently with sodium hydroxide

6.1

2-HYDROXYBIPHENYL
90-43-7

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

Producing carbon monoxide, acrid smoke and irritant fumes • Reacts with strong bases and strong oxidants

PENTACHLOROPHENOL
87-86-5

The substance decomposes on heating above 200 °C, producing toxic fumes and toxic gases including hydrogen chloride, dioxines, chlorinated phenols • Reacts violently with strong oxidants and water, causing fire and explosion hazard

6.1

PENTACHLOROPHENOL, SODIUM SALT
131-52-2

On contact with hot surfaces or flames this substance decomposes forming hydrocarbon chloride, chlorinated phenols, carbon monoxide, and Na₂O • Reacts with strong oxidants causing fire and explosion hazard

6.1

PHENOL
108-95-2

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

May explode on heating above 78 °C • On combustion, forms toxic fumes (carbon monoxide) • Upon heating, toxic fumes are formed • The solution in water is a weak acid • Reacts with oxidants causing fire and explosion hazard

6.1

PYROGALLIC ACID
87-66-1

Upon heating, toxic fumes are formed • The substance is a weak acid • Reacts with oxidants and bases

RESORCINOL
108-46-3

6.1

2,3,4,6-TETRACHLOROPHENOL
58-90-2

6.1

2,3,5,6-TETRACHLOROPHENOL
935-95-5

The vapour is heavier than air

The substance decomposes on heating and on contact with strong oxidants producing toxic and irritant vapours and fumes such as hydrogen chloride, phosgene • The substance is a weak acid

6.1

2,3,4-TRICHLORO PHENOL
15950-66-0

The substance decomposes on heating producing carbon monoxide, hydrogen chloride • Reacts with oxidants, acid anhydrides, and acid chlorides

2,3,5-TRICHLORO PHENOL
933-78-8

The substance decomposes on heating, on burning and on contact with strong oxidants producing toxic and irritant vapour and fumes (hydrogen chloride and phosgene) • The substance is a weak acid • Reacts with strong oxidants

2,3,6-TRICHLOROPHENOL
933-75-5

May explode on heating • The substance decomposes on heating, on contact with strong oxidants producing toxic and irritant vapours and fumes (hydrogen chloride and phosgene) • The substance is a weak acid • Reacts with strong oxidants

2,4,5-TRICHLOROPHENOL
95-95-4

May explode on heating to decomposition • The substance decomposes on heating and on contact with strong oxidants producing toxic and irritating fumes (chlorine, hydrochloric acid) • The substance is a weak acid • Reacts with strong oxidants • Reacts in an alkaline medium at high temperatures producing highly toxic chlorinated dioxins

2,4,6-TRICHLOROPHENOL
88-06-2

On combustion, forms toxic fumes (HCI, CO) • The substance decomposes on heating or on burning producing toxic and corrosive fumes (hydrogen chloride and chlorine) • Reacts violently with strong oxidants