| 摘要 |
In the present invention, there is provided a mat material including a glass fiber. The glass fiber includes 52 to 62% by weight of SiO 2 , 9 to 17% by weight of Al 2 O 3 , 17 to 27% by weight of CaO, 0 to 9% by weight of MgO, 0 to 4% by weight of TiO 2 , and 0 to 5% by weight of ZnO. The glass fiber includes substantially no B 2 O 3 . The glass fiber includes 0 to 2% by weight of a total sum of Na 2 O + K 2 O. The mat material is interposed between an upper base and a lower base. A surface pressure is 100 kPa or more when a temperature of the upper base and a temperature of the lower base reaches 700 °C and 400°C, respectively, in a case of increasing the temperature of the upper base at a temperature increase rate of 15 °C/minute at the same time of increasing the temperature of the lower base at a temperature increase rate of 8.6 °C/minute where GBD (Gap Bolt Density) = 0.35 g/cm 3 . |
