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