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High Alumina Hollow Gray Ceramic Cenosphere Competitive Price. High Strength & Lightweight: Hollow microspheres with high strength, wear resistance, and low weight for easy transport. Versatile Industrial Use: Ideal for coatings, paints, plastics, oil drilling, cement, and aerospace industries. Thermal Insulation: Excellent thermal insulation and flame retardant properties due to hollow structure. Eco-Friendly Material: Made from recycled fly ash, offering a sustainable solution for industrial fillers. High Buoyancy: Minimum 95% floating rate, suitable for buoyancy applications like EPS fillers. Quality Assurance: Manufactured with in-house technicians and laboratory for guaranteed product quality.