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Chemical Name CAS-Number |
Physical |
Chemical |
UN Class or Division / Subsidiary Risks |
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ACETIC ACID |
The substance is a medium strong acid • Reacts violently with oxidants such as chromium trioxide and potassium permanganate • Reacts violently with strong bases • Attacks many metals forming combustible gas |
8 |
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ACETIC ANHYDRIDE |
The substance decomposes on heating producing toxic fumes and gases including acetic acid • Reacts violently with boiling water, steam, strong oxidants, alcohols, amines, strong bases, and many other compounds • Attacks many metals in presence of water • The liquid is very corrosive, especially in presence of water or moisture |
8/ 3 |
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ACETYLSALICYLIC ACID |
Dust explosion possible if in powder or granular form, mixed with air |
The substance decomposes on contact with hot water or when dissolved in solutions of alkali hydroxides and carbonates • Upon heating, toxic fumes are formed • Reacts with strong oxidants, strong acids, strong bases |
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ACRYLIC ACID |
The vapour is heavier than air • Vapour forms explosive mixture with air |
The substance polymerizes readily due to heating, under the influence of light, oxygen, oxidizing agents such as peroxides or other activators (acid, iron salts), with fire or explosion hazard • Upon heating, toxic fumes are formed • The substance is a medium strong acid • Reacts violently with oxidants causing fire and explosion hazard • Reacts violently with strong bases and amines • Attacks many metals, including nickel and copper |
8/ 3 |
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ADIPIC ACID |
Dust explosion possible if in powder or granular form, mixed with air • If dry, it can be charged electrostatically by swirling, pneumatic transport, pouring, etc. |
The substance decomposes on heating producing volatile acidic vapours of valeric acid and other substances • The substance is a weak acid • Reacts with oxidizing materials |
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L-ASCORBIC ACID |
The solution in water is a medium strong acid • Attacks many metals in presence of water |
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BENZOIC ACID |
Dust explosion possible if in powder or granular form, mixed with air |
The solution in water is a weak acid • Reacts with oxidants |
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BUTYRIC ACID |
8 |
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n-CAPROIC ACID |
May explode on heating • On combustion, forms toxic/irritant gases • The substance is a medium strong acid • Reacts violently with oxidants (for instance chromium trioxide) causing fire and explosion hazard • Reacts vigorously with bases causing heat and pressure rise hazard • Attacks many metals forming combustible gas |
8 |
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CHLOROACETIC ACID |
The substance decomposes on heating producing toxic and corrosive gases (hydrogen chloride, phosgene) • The solution in water is a strong acid, it reacts violently with bases and is corrosive |
6.1/ 8 |
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CITRIC ACID |
Dust explosion possible if in powder or granular form, mixed with air |
Reacts with oxidants, reductants, bases |
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CITRIC ACID HYDRATE |
The solution in water is a medium strong acid • Reacts violently with metal nitrates • Reacts with strong bases and oxidants • The substance will corrode copper, zinc, aluminium, and their alloys |
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CROTONIC ACID |
The substance may polymerize under the influence of UV-light or moisture • The solution in water is a weak acid • Reacts violently with bases, oxidants, reducing agents, causing fire and explosion hazard |
8 |
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DICHLOROACETIC ACID |
The substance decomposes on heating producing toxic and corrosive fumes (phosgene, hydrogen chloride) • The substance is a medium strong acid • Attacks many metals forming flammable hydrogen gas • Attacks rubber |
8 |
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2,4-DICHLOROPHENOXY ACETIC ACID |
The substance decomposes on heating producing hydrogen chloride and phosgene • The substance is a weak acid • Reacts with strong oxidants causing fire and explosion hazard |
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ETHANEDIOIC ACID, DIHYDRATE |
The substance decomposes on rapid heating above about 150°C producing toxic gas • The solution in water is a medium strong acid which reacts violently with strong bases • Reacts violently with oxidants causing fire and explosion hazard • Reacts with silver, forming explosive products |
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2-ETHYL HEXANOIC ACID |
As a result of flow, agitation, etc, electrostatic charges can be generated • Vapour mixes readily with air |
The substance is a strong reducing agent and reacts with oxidants • Reacts with strong oxidants |
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FLUOROACETIC ACID |
6.1 |
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FORMIC ACID |
The substance decomposes on heating producing carbon monoxide • The substance is a medium strong acid • Reacts violently with oxidants • Reacts violently with strong bases causing fire and explosion hazard • Attacks many metals in presence of water • Attacks many plastics |
8 |
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ISOBUTYRIC ACID |
3/ 8 |
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LACTIC ACID |
The substance is a medium strong acid • Attacks many metals in presence of water |
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MALEIC ACID |
On combustion, forms irritating smoke (maleic anhydride) • The substance decomposes on heating and on burning producing highly irritating fumes (maleic anhydride) • The solution in water is a medium strong acid |
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MALEIC ANHYDRIDE |
The solution in water is a strong acid, it reacts violently with bases and is corrosive • Reacts with strong oxidants |
8 |
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METHACRYLIC ACID |
The substance polymerizes easily due to heating or under the presence of light, oxygen, oxidizing agents such as peroxides, or in the presence of traces of hydrochloric acid, with fire or explosion hazard • The substance decomposes on heating producing acrid fumes • The substance is a strong reducing agent and reacts with oxidants • The substance is a medium strong acid • Attacks metals |
8 |
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2-METHYL-4-CHLOROPHENOACETIC ACID |
The substance decomposes on heating producing toxic and corrosive fumes including hydrogen chloride • The substance is a weak acid |
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OXALIC ACID |
On contact with hot surfaces or flames this substance decomposes forming formic acid and carbon monoxide • The substance is a strong reducing agent and reacts with oxidants • The solution in water is a medium strong acid • Reacts violently with strong oxidants causing fire and explosion hazard • Reacts with some silver compounds to form explosive silver oxalate |
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PALMITIC ACID |
On heating forms carbon oxides • The substance is a weak acid • Reacts with bases, oxidants, and reducing agents |
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PHTALIC ANHYDRIDE |
8 |
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PHTHALIC ACID |
The solution in water is a medium strong acid |
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PROPIONIC ACID |
The substance is a medium strong acid • Reacts with oxidants • Attacks many metals in presence of water |
8 |
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PROPIONIC ANHYDRIDE |
The vapour is heavier than air |
On combustion, forms toxic gases • Reacts with oxidants, bases and water |
8 |
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SALICYLIC ACID |
Dust explosion possible if in powder or granular form, mixed with air |
The substance decomposes on heating producing phenol vapours • The substance is a medium strong acid • Reacts violently with strong bases and strong oxidants |
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STEARIC ACID |
The substance decomposes on heating producing carbon oxides • The substance is a weak acid • Reacts with bases, oxidants and reducing agents |
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SULPHANILIC ACID |
On combustion, forms toxic gases of carbon, nitrogen and sulphur oxides • The substance decomposes on heating • Reacts with oxidants |
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TEREPHTHALIC ACID |
Dust explosion possible if in powder or granular form, mixed with air |
Reacts violently with strong oxidants |
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p-TOLUENESULFONIC ACID |
The substance decomposes on burning producing carbon oxides and sulphur oxides • The substance is a strong acid, it reacts violently with bases and is corrosive • Attacks many metals forming extremely flammable gas |
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2,4,5-TRICHLOROPHENOXYACETIC ACID |
6.1 |
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TRIFLUOROACETIC ACID |
8 |
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TRIMELLITIC ANHYDRIDE |
Dust explosion possible if in powder or granular form, mixed with air • If dry, it can be charged electrostatically by swirling, pneumatic transport, pouring, etc |
Reacts violently with oxidants • Reacts slowly with water to form trimellitic 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.