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Industrial Ammonium Fluoride Nh4f for Glass Etching and Surface Treatment. High Purity Grade: Reagent grade with assay 96.0% min and purity 90%-99%. ISO Certified: Manufactured under ISO certification standards. Factory Direct Supply: Direct supply from Fairsky factory, not a trading company. Fast Sample Delivery: Samples available and can be sent within 3 days. Custom Packaging: Support for custom logos and labels on packaging. Flexible Payment Terms: Accepts T/T, L/C at sight, and D/P at sight. Strict Quality Control: Professional QC team with samples kept for two years. Global Shipping: Shipment arranged within 15 days from Shanghai Port.