In an October 15, 2013 post, we described the opinions of UN experts on GHS corrosivity criteria. There were a number of options with various levels of support.
At the 26th session of the UN Sub-Committee of Experts on GHS, which took place December 4-6, 2013, UN experts continued discussions around the topic of corrosivity criteria. The Sub-Committee was informed that the “Joint TDG-GHS Working Group on corrosivity criteria” had reached an agreement on working on a possible solution on the basis of an outline developed by the Netherlands. The Sub-Committee agreed to continue working on the development of a proposal on the basis of the following outline:
- Retaining the GHS sub-categories 1A, 1B and 1C, as these sub-categories are central to GHS corrosivity classification, and are used to establish workplace standards for storage and safe handling.
- Confirmation of the correlation between the GHS sub-categories 1A, 1B and 1C with Packing Groups I, II and III respectively where these are based on human, animal or in vitro data. The challenge was in assigning packing groups in the transport sector when the GHS alternative methods, particularly the additivity and non-additivity approaches, were applied. A further challenge lay in identifying additional criteria for when Packing Group I should be assigned for substances and mixtures classified as GHS sub-category 1A and not included in the Dangerous Goods List.
Here is a summary of the outline from which a proposal will be developed:
The Sub-Committee also agreed to request the TDG Sub-Committee to consider mechanisms to address the issue outlined in the first row of the table, i.e. developing a mechanism to assign substances to Packing Group I for transport purposes on the basis of considerations that could go beyond hazard classification.
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