Chemical Name

CAS-Number

Physical

Chemical

UN Class/Div /  Subsidiary RisksChemical

ACETAL
105-57-7

3

ACETALDEHYDE
75-07-0

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

The substance can form explosive peroxides in contact with air • The substance may polymerize under the influence of acids, alkaline materials, such as sodium hydroxide, in the presence of trace metals (iron) with fire or explosion hazard • The substance is a strong reducing agent and reacts violently with oxidants • Reacts violently with various organic substances, halogens, sulfuric acid and amines, causing fire and explosion hazard

3

ACROLEIN
107-02-8

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

The substance can form explosive peroxides • The substance may polymerize with fire and explosion hazard • Upon heating, toxic fumes are formed • Reacts with alkalis, acids, amines, sulfur dioxide, thiourea, metal salts and oxidants causing fire and explosion hazard

6.1/ 3

BUTYLALDEHYDE
123-72-8

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

The substance may polymerize due to heating, under the influence of acids or alkalis • On combustion, forms toxic gases • Reacts with oxidants • Reacts violently with strong acids and bases

3

CHLORAL
75-87-6

6.1

CHLOROACETALDEHYDE
107-20-0

The vapour is heavier than air

Upon heating, toxic fumes are formed • Reacts with water to form a hydrate with the evolution of some heat • Reacts with oxidants and acids, causing explosion hazard • The anhydrous substance can polymerize on standing

6.1

o-CHOROBENZALDEHYDE
89-98-5

The substance decomposes on heating, producing toxic and corrosive fumes including hydrogen chloride • Acts with iron, strong bases, strong oxidants, strong reducing agents and moisture

CROTONALDEHYDE
4170-30-3

6.1/ 3

2,2-DIMETHYL-1,3-DIOXOLANE-4-METHANOL
100-79-8

Reacts with oxidants

p-DIOXANE
123-91-1

The vapour is heavier than air and may travel along the ground; distant ignition possible • As a result of flow, agitation, etc, electrostatic charges can be generated

The substance can form explosive peroxides • Reacts vigorously with strong oxidants and concentrated strong acids • Reacts explosively with some catalysts (eg, Raney-nickel above 210 °C) • Attacks many plastics

3

2-ETHYL HEXALDEHYDE
123-05-7

The vapour is heavier than air

The substance can form explosive peroxides on long-lasting contact with oxygen or air • The substance polymerize on contact with sodium hydroxide, ammonia, butyl- and dibutylamine, inorganic acids • Reacts with oxidants

3

FORMALDEHYDE
50-00-0

3/ 8

GLYCIDALDEHYDE
765-34-4

3/ 6.1

GLUTARALDEHYDE
111-30-8

Produces acrid smoke and fumes (carbon monoxide, carbon dioxide)

3-HYDROXYBUTYRALDEHYDE
107-89-1

6.1

ISOBUTYRALDEHYDE
78-84-2

3

METHYLAL
109-87-5

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

The substance can presumably form explosive peroxides • May explode on heating and on burning producing carbon dioxide and/or carbon monoxideReacts vigorously with strong oxidants causing fire and explosion hazard

3

PARAFORMALDEHYDE
30525-89-4

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

The substance decomposes on heating producing formaldehyde • Reacts with oxidants • Reacts with strong acids and strong bases producing formaldehyde

4.1

PARALDEHYDE
123-63-7

3

PHENYL CHLOROFORMATE
1885-14-9

6.1/ 8

PROPANAL
123-38-6

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

The substance may polymerize due to heating and under the influence of acids and caustics • On combustion, forms toxic gases (carbon oxides) and combustible gas • Reacts violently with oxidants, acids and bases

3

VALERALDEHYDE
110-62-3