1. Expansile coefficient: 3.3*10(-6); So this could bear the high temperature difference. 2. Don't need hardened, and get the better performance than normal hardened glass; 3. Soft temperature: 815 degree C; ; 4. Can normal Work at 550 degree C for 10hours 5. Can normal work at 450 degree C for more than 10hous; 6. Widely used on lighting, Oven's inner wall, micro-wave oven and fire resistant glass.