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70% 90% High Alumina Regenerative Ceramic Ball Thermal Storage Refractory Fire Balls for Rto. Wide Size Range: Available in diameters from 6mm to 75mm with precise tolerances. Versatile Applications: Ideal for RTO, ammonia plants, steel industry, and chemical fertilizer processes. ISO 9001 Certified: Manufactured under strict quality control with ISO9001:2008 certification. Fast Delivery: Lead time within 15 workdays for both peak and off-peak seasons. Global Export Capability: Serving markets across seven continents with FOB, CIF, and EXW terms.