Safety hazard grade of chemical reagents

Hazardous chemicals labels pasted on chemical containers contain the following meanings.

E: Explosive

T: Toxic

O: Oxidizing agent

Xn: Harmful

F++: Extremely flammable

Xi: Irritant

F+: Highly flammable

C: Corrosive

F: 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.

R10: Flammable.

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.