| 摘要 |
Provided is a mat-like holding seal material made of an inorganic fiber holding an exhaust gas treatment unit and being provided between the exhaust gas treatment unit and a metal casing housing the exhaust gas treatment unit, in which the holding seal material includes a first principal surface and a second principal surface, the holding seal material includes a first region with a predetermined thickness including the first principal surface and a second region with a predetermined thickness including the second principal surface, the first region is soaked with a first organic binder, the second region is soaked with a second organic binder, a glass transition temperature of the first organic binder is higher than a glass transition temperature of the second organic binder, and the first principal surface is in contact with the exhaust gas treatment unit.
This holding seal material can be wound around an exhaust gas treatment unit without causing a gap generated by an inside and outside circumference difference, can prevent the leakage of gas from an exhaust gas purification apparatus, and does not easily decrease operational efficiency when being transported or arrayed. |
