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See Chinese contents: GB/T 39429-2020 GB/T 39429-2020: Non-destructive testing -- Method for thermoelectric sorting of electrically conductive materials
This Standard specifies the techniques and methods for material sorting of conductive materials using direct and comparative thermoelectric potential sorters based on the Seebeck effect. This Standard is applicable to the sorting of metal materials, the piece-by-piece manual sorting of metal workpieces and automatic sorting of large quantities of metal workpieces. The identification and sorting of metal plating thickness, hardness and hardened layer depth may take this Standard as a reference.
