The heat insulation of the hearth pipes of continuous heating furnaces is important because 15-35% of the heat input for heating the steel is lost with the cooling water [1]. The hearth pipes are insulated with various materials and by various methods~ The use of ceramic fibrous materials and products for this purpose is promising. These materials possess usefu[ properties like low density, thermal conductivity, and heat capacity and high thermal strength and elasticity, and they are convenient to use [2, pp. 87-92]. Numerous proposals have been put forward for the cQnstruction of the insulation of the hearth pipes with ceramic fibrous materials [3].The heat-insulation properties on water-cooled models were determined in tests with refractory fibers, with cardboard processed from high-alumina fiber, and with asbestos fabric bonded with a high-temperature adhesive.