For a tool to meet the IEC 60900 standard, it must pass a series of "type tests" designed to simulate extreme working conditions: IEC 60900:2018
Tools are cooled to -25°C and struck to ensure the insulation doesn't crack or peel. Adhesion Test: iec 60900 pdf
Here’s a concise, informative review of the (focused on the PDF version), written as if from a professional electrical engineer or safety manager. For a tool to meet the IEC 60900