Holding material for catalytic converter

Abstract

A holding material is provided for a catalytic converter having a catalyst carrier, a casing for receiving the catalyst carrier. The holding material is interposed in a gap between the catalyst carrier and the casing while wound on the catalyst carrier. The holding material is constituted by a sewn product of a mat material formed by collection of not smaller than 100 cc/5 g by wet volume of inorganic fiber without use of any binder.

What is claimed is:  
     
         1 . A holding material for a catalytic converter, interposed in a gap between a catalyst carrier and a casing receiving the catalyst carrier, comprising: 
 a mat material formed of not smaller than 100 cc/5 g by wet volume of inorganic fiber without use of any binder and sewn with sewing thread.    
     
     
         2 . The holding material according to  claim 1 , wherein the mat material is sewn at intervals of a sewing pitch of 3 mm to 30 mm.  
     
     
         3 . The holding material according to  claim 1 , wherein the sewing thread is made of one of metal fiber sewing thread, inorganic fiber sewing thread and organic fiber sewing thread.  
     
     
         4 . The holding material according to  claim 1 , wherein the sewing thread is made of at least one member selected from the group consisting of alumina fiber, mullite fiber, silica-alumina fiber, silica fiber, glass fiber, rock wool and biodegradable fiber.  
     
     
         5 . The holding material according to  claim 1 , wherein the sewing thread is made of a mixture of at least two members selected from the group consisting of metal fiber, inorganic fiber, and organic fiber.