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High Quality Zinc Selenite Znseo3 CAS 13597-46-1. Custom Packaging: Flexible packaging options including 25kg bags, drums, or customized requirements. ISO 9001 Certified: Company passed ISO 9001 management system with strict SOP for production and sales. Free Samples: Small free samples available for quality evaluation prior to bulk purchase. Manufacturer Direct: Direct from factory in Shandong with 30,000 sqm area and senior engineering team.