Safety hazard grade of chemical reagents
Hazardous chemicals labels pasted on chemical containers contain the following meanings.
O: Oxidizing agent
F++: Extremely flammable
F+: Highly flammable
N: Dangerous for the environment
T+: Very toxic
Chemicals data sheets contain codes that mark certain “hazard information”, such as R23, R45, etc. These hazard information codes have the following meanings.
R1: Easy to explode when dry.
R2: It is dangerous to explode in case of vibration, friction, flame or other ignitions.
R3: There is an extreme risk of explosion in the event of vibration, friction, flame or other ignitions.
R4: Formation of very sensitive explosive metal compounds.
R5: Heating can cause explosion.
R6: Contact with or without air can explode.
R7: It will cause a fire.
R8: Flammable materials can cause fire.
R9: Mixed with flammable materials will explode.
R11: It’s very flammable.
R12: Extremely flammable.
R13: Extremely flammable liquefied gases.
R14: Water reacts violently.
R15: Water releases extremely flammable gases.
R16: Mixing with oxides will explode.
R17: It can spontaneously ignite in air.
R18: Flammable and explosive vapor-air mixtures may be formed when used.
R19: It is possible to produce explosive peroxide.
R20: Inhalation is harmful.
R21: Contact with skin is harmful.
R22: Swallowing is harmful.
R23: Inhalation is toxic.
R24: Contact with skin is toxic.
R25: Swallowing is toxic.
R26: Inhalation is extremely toxic.
R27: Contact with skin is extremely toxic.
R28: Deglutition is extremely toxic.