1. Alumina plates has high temperature and heat resistance. 2. The alumina plates has high strength, excellent corrosion resistance, acid and alkali resistance, and other superior properties. 3. The thermal shock resistance and low coefficient of thermal expansion of alumina plates are also major advantages. 4. Alumina plates have good thermal stability performance. 5. Alumina plates not only have low expansion but also low dielectric constant (5.3MHz).