There are some differences in the hazard classification
system used in the GHS, and therefore
CLP, compared to the previous classification
system, which was set out in the dangerous
substances directive (DSD) and the dangerous
preparations directive (DPD). Under the DSD/
DPD system, dangerous substances and mixtures
are allocated to 15 hazards classes and
their associated risk phrases. Under CLP, hazardous
substances and mixtures are allocated to
28 hazard classes, which are further subdivided
into numbered divisions or categories, with the
lowest numbers representing the most severe
hazards. In some cases, hazard statements may
be used for two or more hazard categories. Under
CLP the criteria for determining whether a substance
or mixture is classified as hazardous may
be different. There are also some new hazard
classes. This means that some of the chemical
substances and mixtures that you are familiar
with may change classification, or become classified
as hazardous for the first time.
CLP has also introduced some terminology
changes that you should be aware of, as
shown below.