
Fire Assay Flux Used in Geochemical Assay Laboratories. Ultra-Low Gold Content: Gold levels less than 1-1.5ppb in litharge component for accurate low-level assay work. SGS Certified Raw Materials: Litharge certified with gold <1 ppb and Silver <1 ppm by SGS. Customized Dimensions: Product dimensions can be customized to meet specific customer requirements. Tailored Composition: Includes Borax, sodium carbonate, silicon oxide, and fluorite ordered per customer needs. Assay Grade Purity: High purity 99% Lead Oxide (Litharge) specifically for geochemical assay laboratories. Rapid Sample Delivery: Sample preparation time ranges from 7 to 15 days. Yellow Powder Appearance: Distinctive yellow powder form suitable for fire assay applications. Premium Manufacturer: Chinese premier manufacturer and supplier of quality gold-free flux and litharge.