A molten metal furnace capable of preventing or suppressing the molten metal leakage and controlling the leakage direction. A molten metal furnace including an outer wall in an outer peripheral portion and a molten metal storage part holding a molten metal, in which a plurality of lining material layers are arranged on an inner wall of the molten metal furnace forming the molten metal storage part; of the lining material layers, a first lining layer constituting a surface in contact with the molten metal is made of a refractory material; and a sealing material is provided on at least one boundary between the first lining layer and the outer wall.

A device operates at high temperature, especially up to 550 C. and in particular between 50 and 350 C., such as an oven or an oven part. The device includes at least one insulating product formed of at least two layers, including a first layer, placed towards the heating zone and/or the heating element(s) to be insulated, formed of mineral wool(s) and/or fibre(s) and having a density of less than 120 kg/m.sup.3, and a second layer, further away, chosen from insulators formed of aerogel(s) or of amorphous silica or vacuum insulators or any other superinsulator. Additionally, an insulating product is appropriate for this device.

A device operates at high temperature, especially up to 550 C. and in particular between 50 and 350 C., such as an oven or an oven part. The device includes at least one insulating product formed of at least two layers, including a first layer, placed towards the heating zone and/or the heating element(s) to be insulated, formed of mineral wool(s) and/or fibre(s) and having a density of less than 120 kg/m.sup.3, and a second layer, further away, chosen from insulators formed of aerogel(s) or of amorphous silica or vacuum insulators or any other superinsulator. Additionally, an insulating product is appropriate for this device.

Disclosed are a fibrous insulation block which can improve work efficiency of lining construction in various types of refractory furnace in iron works, and a construction method for a heated furnace-surface lining using the same. Specifically disclosed is a fibrous insulation block which comprises: a unit block (2) formed by laminating fibrous insulation blankets under pressure; a packing material (3) which has a pressing surface abutting section (5) covering at least a part of each pressing surface (2a, 2b) which are the side surfaces of the unit block in the direction in which the blankets are laminated, and a heating surface protection section (6) connected to the pressing surface abutting section so as to cover at least a part of a heating surface (2c) of the unit block, and in which a boundary section (7) between the pressing surface abutting section and the heating surface protection section covers an angle section formed by the pressing surfaces and the heating surface of the unit block; and a binding band (4) which maintains the shape of the unit block (2) using the packing material (3). The heating surface protection section (6) of the packing material (3) can be moved by the removal of the binding band and disposed on the same plane as the pressing surface abutting section, and has handhold sections (10) provided therein.