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Hollow Ceramic Microspheres Gray Cenospheres for Ceramics. High Crush Strength: Compressive strength between 500 to 15000 psi ensures durability under pressure. Chemical Stability: pH 6 with high aluminum silicate content provides excellent corrosion resistance. Versatile Industry Usage: Used in ceramics, oil drilling, plastics, paints, and aerospace industries. Free Sample Availability: Samples provided free of charge, customer only pays shipping cost.