Abstract: A catalytic converter holding mat that is inexpensive, and exhibits an excellent heat insulation capability is provided by utilizing an inexpensive heat insulating material that exhibits an excellent heat insulation capability. The catalytic converter holding mat is provided in a gap between a tubular catalyst carrier and a casing that houses the catalyst carrier, and includes a retaining section that is formed of first inorganic fibers having a thermal shrinkage ratio at 1000° C. of 1% or less, and an insulation section that is disposed adjacent to the retaining section, and formed of second inorganic fibers having a thermal shrinkage ratio at 1000° C. of more than 1%.

Abstract: A holding material for gas treatment device, gas treatment device, and methods for those achieve proper control of a frictional resistance between the holding material and a casing. A method of treating a gas with a gas treatment device including a treatment structure, a casing made of a metal for housing the treatment structure and a holding material made of inorganic fibers placed between the treatment structure and the casing, the method including: placing an organic polymer between the holding material and the casing so that the organic polymer is brought into contact with an outer surface of the holding material and an inner surface of the casing during treatment of the gas; and treating the gas under a condition that a temperature of the casing is equal to or higher than a softening temperature of the organic polymer and lower than a decomposition temperature of the organic polymer.

Abstract: A holding material for gas treatment device, gas treatment device, and methods for those achieve proper control of a frictional resistance between the holding material and a casing. A method of treating a gas with a gas treatment device including a treatment structure, a casing made of a metal for housing the treatment structure and a holding material made of inorganic fibers placed between the treatment structure and the casing, the method including: placing an organic polymer between the holding material and the casing so that the organic polymer is brought into contact with an outer surface of the holding material and an inner surface of the casing during treatment of the gas; and treating the gas under a condition that a temperature of the casing is equal to or higher than a softening temperature of the organic polymer and lower than a decomposition temperature of the organic polymer.

Abstract: A catalytic converter holding mat that is inexpensive, and exhibits an excellent heat insulation capability is provided by utilizing an inexpensive heat insulating material that exhibits an excellent heat insulation capability. The catalytic converter holding mat is provided in a gap between a tubular catalyst carrier and a casing that houses the catalyst carrier, and includes a retaining section that is formed of first inorganic fibers having a thermal shrinkage ratio at 1000° C. of 1% or less, and an insulation section that is disposed adjacent to the retaining section, and formed of second inorganic fibers having a thermal shrinkage ratio at 1000° C. of more than 1%.

Abstract: An inexpensive sound and heat insulating material that is able to prevent fine fiber granules generated by heat deterioration of the inorganic fiber as a main component of the base material from being scattered while maintaining the sound insulating property and heat resistant property. A coating layer of a lepidoflaky mineral is formed by coating, followed by drying, a water base dispersion of the lepidoflaky mineral by brushing, spraying, roll coating, dipping or showering on the surface of the base material comprising a heat-resistant fiber such as an inorganic fiber. Further exhaust manifold covers, engine exhaust pipes sound absorbing blocks made of, or utilizing the sound and heat insulting material.