This standard is a product safety specification concerning the limit requirements for hazardous heavy metals in plastic materials. It specifies the specific limit indicators for four heavy metal elements—lead, cadmium, hexavalent chromium, and mercury—in plastic materials and their products (e.g., a lead limit of 0.1%), providing a unified basis for assessing the environmental and safety compliance of plastic products. To verify compliance with this standard, testing must be conducted in accordance with the aforementioned series of method standards (such as GB/T 38290, GB/T 38291, etc.). These methods primarily utilize instruments such as inductively coupled plasma mass spectrometers for determination. This limit standard is often used in conjunction with relevant determination method standards, together forming a comprehensive technical control system.