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Class 8: Corrosives

Hazard class 8: Corrosive substances

The dangerous goods regulations define corrosive substances as a substance that by a chemical action, causes irreversible damage to the skin, or in the case of a leakage, will materially damage or even destroy other goods or the means of transport. Corrosive substances can be both a solid and liquid form.

Class 8 hazardous materials do not have any divisions but could be an acid or an alkali. Acids have a pH less than 7, and Alkalis have a pH greater than 7 while neutral substances have a pH equal to 7.

Packing groups

Although Class 8 dangerous goods do not have any other divisions, corrosive substances have been assigned a packing group which indicates the degree of danger.

Packing Group I: Substances presenting high danger
Packing Group II: Substances presenting medium danger
Packing Group III: Substances presenting low danger

Packing group Exposure time Observation period Effect
I ≤ 3 min ≤ 60 min Full thickness destruction of intact skin
II > 3 min ≤ 1h ≤ 14 d Full thickness destruction of intact skin
III > 1 h ≤ 4h ≤ 14 d Full thickness destruction of intact skin
III - - Corrosion rate on either steel or aluminium surfaces exceeding 6.25 mm a year at a test temperature of 55 ºC when tested on both materials


Examples of commonly transported explosives

Class 8 dangerous goods examples are acid batteries fluid, alkali batteries fluid, formaldehyde, hydrochloric acid, iodine, methacrylic acid, nitric acid, sulphuric acid.

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