1. What is the minimum order quantity for custom specifications? A: The minimum order quantity for custom specifications (such as particle size, purity adjustment) is 500kg, and we can provide customized production according to customer specific needs. 2. Can you provide third-party testing reports? A: Yes. We can provide third-party testing reports issued by authoritative institutions, covering product purity, particle size, heavy metal content and other indicators to meet customer regulatory and quality inspection needs.