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Class 8 Dangerous Goods
Corrosives can cause severe injuries, corrode
unsuitable containers, react with other chemicals,
produce poisonous gases or ignite other
Many corrosives are incompatible and may react
dangerously with each other. For example:
 some acids on contact with other acids or
bases (alkalies) may 'boil' explosively
 liquid pool chlorine in contact with acids will
liberate dangerous chlorine gas
Products with the same UN number can be
stored together. Products with different UN
numbers should be stored accordingly:
Corrosives types
Chemical compatibility
PG 1
PG 11
expert advice needed
liquids and liquids
5m apart
liquids and solids
side by side or
solids above liquids
solids and solids
not specified
liquids and liquids
side by side
liquids and solids
side by side or
solids above liquids
solids and solids
not specified
Corrosives may be acids or alkalies (bases). They
may be liquid or in solid form such as powder,
granules or flakes. Even though they all are
Dangerous Goods of Class 8, many are NOT
compatible with each other and in fact may react
dangerously with each other.
PG 111
Corrosives react with many DG of other classes
and also with non-DG substances. For example,
concentrated sulfuric acid may on contact ignite
sawdust or shredded paper.
For UN number identification check the package
label or Material Safety Data Sheet (MSDS).
If different corrosives have to be stored in the
same area, precautions must be taken to prevent
contact between incompatible corrosives.
Packing Groups
Corrosives are grouped into Packing Groups (PG)
according to their 'strength'.
PG 1 Great danger (eg. concentrated nitric
PG 11 Medium danger (eg. hydrochloric acid,
caustic soda)
PG 111 Minor danger (eg. phosphoric acid,
liquid pool chlorine).
To identify the PG of a product check the package
label or Material Safety Data Sheet (MSDS) or
ask supplier.
Storage methods
All corrosives should be stored on pallets, racks or
shelving to allow for detection of leaks, to prevent
contact and reaction between incompatible
'chemicals' and to make clean-up of spills or leaks
All corrosives should be stored at least five (5)
metres away from Dangerous Goods of any other
class to prevent accidental contact and reaction.
All corrosive liquids should be stored on the lower
racks or shelves to reduce the risk of breakage
and spillage.
Because corrosives may react with non-DG goods
or corrode them or their packagings, the
corrosives storage area should not be used to
store any other dangerous goods. DG licensing is
required if the total quantity on site exceeds:
* 50 kg/L of PG I
* 500 kg/L of PG 11
* 1,000 kg/L of PG 111
Storage areas for solids should be designed to
prevent contact with in flowing liquids such as
rain. Appropriate spillage clean-up and personal
protective equipment should be provided and kept
in good order.
The type of clean-up and personal protective
equipment required, willdepend on the quantities
of DG, their types and handling methods. The
PPE should usually include corrosive resistant
gauntlets and boots, a corrosion resistant face
shield, a plastic bucket or garbage bin with
absorbent material and a broom and shovel.
Diamond class signs (250 mm square) are
required for all licensed storages, and
recommended for smaller storage areas.
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