| 摘要 |
A mat material includes a glass fiber. The glass fiber includes 52 to 62% by weight of SiO2, 9 to 17% by weight of Al2O3, 17 to 27% by weight of CaO, 0 to 9% by weight of MgO, 0 to 4% by weight of TiO2, 0 to 5% by weight of ZnO, substantially no B2O3, and 0 to 2% by weight of a total sum of Na2O+K2O. A surface pressure of the mat material is 100 kPa or more when a temperature of an upper base and a temperature of a 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 a 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/cm3. |
