| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a holding seal material in which holding force between a mat and a metal casing is made sufficient before and after an exhaust gas purification device is used.SOLUTION: A holding seal material contains covered fiber in which the surface of inorganic fiber is covered with binding agent layer. The binding agent layer contains organic binding agent and inorganic binding agent. With the image of the covered fiber magnified by 1000 times by a scanning type electron microscope, the variation ratio d of the covered fiber diameter shown the following equation (1) is 25% or less: the variation ratio d(%) of the covered fiber diameter=[(D-D)/D]×100 (1). In the equation, d represents the variation ratio of the covered fiber diameter of the covered fiber, Drepresents the average maximum diameter of the covered fiber, Drepresents the average minimum diameter of the covered fiber, and D represents a reference diameter to be the average value of the average maximum diameter Dand the average minimum diameter D.</p> |
