Abstract: An efficient, high output, compact catalytic combustor that is low in combustion cost includes a combustion member having a front surface portion and a rear surface portion. The air-fuel mixture passing from the rear surface portion toward the front surface portion is combusted on the front surface portion. The combustion member is made of a material higher in thermal conductivity than alumina and includes a flame-holding unit for geometrically holding the flames formed on the surface of the combustion member. A catalyst oxide is carried on at least the front surface portion of the combustion member.

Abstract: A battery exhaust gas plug filter is disclosed in which surfaces of pores of an inorganic porous substance composing the filter are coated with a silane or titanium coupling agent inner film before coating them with a fluororesin outer film having finer micro-pores. Accordingly, it is believed that the fluororesin outer film having finer micro-pores comes to be tightly bonded with the surfaces of the pores of the inorganic porous substance through silane or titanium coupling agent inner film, and that even smaller pores of the inorganic porous substance are covered with the silane or titanium coupling agent inner film at least. As a result, the water repellency, gas permeability and strength of the battery exhaust gas plug filter have been improved.