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The purpose of this report is to serve as a technical resource describing the hazard classification of copper metal according to the 8^th Revised Edition of the GHS guidance (UN, 2019). It is intended to help guide regulators and industry groups by providing endpoint-specific hazard classifications that are based on the best available science, along with justifications that outline the classification decision-making process. The report is intended to be consistent with the 8^th Revised Edition of the GHS guidance and will be updated as appropriate as new data become available.

The hazard classifications provided within the report are not specific to any one jurisdiction, but rather reflect globally compliant classifications according to the 8^th Revised Edition of the GHS guidance (UN, 2019). Thus, they do not override any jurisdiction-specific harmonized or other legally binding hazard classifications (e.g., the European Union’s Harmonized Classification, Labelling, and Packaging [CLP] classifications for coated copper flakes).

The two forms of copper metal covered in the report are copper massive and copper powder. These physical forms are defined by their particle size and specific surface area (SSA), and they are each produced through different processes and at different production sites. Therefore, hazard classifications are derived separately for each form.