| Risk | Meaning |
|---|
| R1 | Explosive when dry |
| R2 | Risk of explosion by shock, friction, fire or other source of ignition |
| R3 |
Extreme risk of explosion by shock, friction, fire or other source of ignition |
| R4 | Forms very sensitive explosive metallic compounds |
| R5 | Heating may cause an explosion |
| R6 | Explosive with or without contact with air |
| R7 | May cause fire |
| R8 |
Contact with combustible material may cause fire |
| R9 | Explosive when mixed with combustible material |
| R10 | Flammable |
| R11 | Highly flammable |
| R12 | Extremely flammable |
| R13 | Extremely flammable liquefied gas |
| R14 | Reacts violently with water |
| R15 | Contact with water liberates extremely flammable gases |
| R16 | Explosive when mixed with oxidizing substances |
| R17 | Spontaneously flammable in air |
| R18 |
In use, may form flammable/explosive vapour-air mixture |
| R19 | May form explosive peroxides |
| R20 | Harmful by inhalation |
| R21 | Harmful in contact with skin |
| R22 | Harmful if swallowed |
| R23 | Toxic by inhalation |
| R24 | Toxic in contact with skin |
| R25 | Toxic if swallowed |
| R26 | Very toxic by inhalation |
| R27 | Very toxic in contact with skin |
| R28 | Very toxic if swallowed |
| R29 | Contact with water liberates toxic gas |
| R30 | Can become highly flammable in use |
| R31 | Contact with acid liberates toxic gas |
| R32 | Contact with acid liberates very toxic gas |
| R33 | Danger of cumulative effects |
| R34 | Causes burns |
| R35 | Causes severe burns |
| R36 | Irritating to eyes |
| R37 | Irritating to respiratory system |
| R38 | Irritating to skin |
| R39 |
Danger of very serious irreversible effects |
| R40 | Possible risk of irreversible effects |
| R41 | Risk of serious damage to the eyes |
| R42 | May cause sensitization by inhalation |
| R43 | May cause sensitization by skin contact |
| R44 |
Risk of explosion if heated under confinement |
| R45 | May cause cancer |
| R46 | May cause heritable genetic damage |
| R47 | May cause birth defects |
| R48 | Danger of serious damage to health by prolonged exposure |
| R49 | May cause cancer by inhalation |
| R50 | Very toxic to aquatic organisms |
| R51 | Toxic to aquatic organisms |
| R52 | Harmful to aquatic organisms |
| R53 | May cause long-term adverse effects in the aquatic environment |
| R54 | Toxic to flora |
| R55 | Toxic to fauna |
| R56 | Toxic to soil organisms |
| R57 | Toxic to bees |
| R58 | May cause long-term adverse effects in the environment |
| R59 |
Dangerous to the ozone layer |
| R60 | May impair fertility |
| R61 | May cause harm to the unborn child |
| R62 | Risk of impaired fertility |
| R63 | Possible risk of harm to the unborn child |
| R64 | May cause harm to breast-fed babies |
| R65 | Harmful: may cause lung damage if swallowed |
| R66 | Repeated exposure may cause skin dryness or cracking |
| R67 | Vapours may cause drowsiness and dizziness |