It can be confusing when the classification of a chemical is changed. However, the manufacturer’s SDS should be referred to for the classification of a specific product. We advise that this manganese dioxide may be stored with general dry chemicals, which is consistent with the information in the SDS concerning incompatibilities.
In a survey of a number of SDSs, we only found one which gave manganese dioxide the classification Dangerous Goods Class 5.1 Oxidising solid. Safe Work Australia’s GHS Hazardous Chemical Information List also does not list manganese dioxide as an oxidising solid.1
The criteria for classifying oxidising solids are as given in the UN Manual of Tests and Criteria for Dangerous Goods2 and the UN Model Regulations.3 To determine whether a substance should be classified as a Class 5.1 oxidising solid, the substance is mixed with fibrous cellulose and the rate and intensity of burning of this mixture is compared with that of a reference mixture such as potassium bromate/cellulose. Whether the substance satisfies the criteria for Class 5.1 may depend on factors such as the form of the substance, the particle size, and whether or not the product contains additives or impurities.
1 Safe Work Australia, Hazardous Substances Information System, Safework Australia website, http://hsis.safeworkaustralia.gov.au/GHSInformation/GHS_Hazardous_Chemical_Information_List
2 United Nations. 2016. UN Manual of Tests and Criteria. Sixth revised edition. UNECE website, http://www.unece.org/trans/areas-of-work/dangerous-goods/legal-instruments-and-recommendations/un-manual-of-tests-and-criteria/rev6-files.html
3 United Nations. 2015. UN Recommendations on the Transport of Dangerous Goods Model Regulations. Nineteenth revised edition. UNECE website, http://www.unece.org/trans/danger/publi/unrec/rev19/19files_e.html
‘Manganese dioxide’, Safety Data Sheet, Chem-Supply website, https://www.chemsupply.com.au/documents/ML0171CH49.pdf (February 2016)