Calcined Alumina for Ceramic/Electronic Substrate/Electric Vacuum Tubes/Ceramic Glaze, etc. High Alfa Phase Conversion: Ensures high hardness, purity, and stable thermal performance for superior ceramic products. Low Sodium Content: Optimized for high-temperature applications and electronic ceramics with low shrinkage. Customizable Particle Size: D50 particle size can be adjusted appropriately according to specific customer needs. High Electrical Insulation: Ideal for electronic vacuum shells, spark plugs, and high-frequency insulating porcelain. High Thermal Conductivity: Provides excellent heat transfer for wear-resistant ceramics and refractory materials. OEM and ODM Services: Full customization support available with dedicated R&D engineers and production lines. Free Sample Availability: 1kg free sample provided; freight charges are refundable or deductible from future orders. Fast Delivery Time: Shipment typically within 15 days after payment confirmation for most products.