A fireproof heat insulating board including a foamed resin molded body filled with a slurry, the foamed resin molded body having continuous voids, wherein the filled slurry forms a hydrate containing water of crystallization in an amount of 50 kg/m.sup.3 or more through hydration reaction after the filling, and at least a part of the surface of the board is reinforced with one or more inorganic fibers selected from the group consisting of a basalt fiber and a ceramic fiber.

A mat material having a sufficiently high initial compression surface pressure is provided. The mat material of the present disclosure includes inorganic fibers; and an inorganic binder and an organic binder attached to the inorganic fibers, wherein the mat material has an initial compression surface pressure of 900 kPa or more as measured when compressed to a bulk density of 0.50 g/cm.sup.3.

A mat material having a sufficiently high initial compression surface pressure is provided. The mat material of the present disclosure includes inorganic fibers; and an inorganic binder and an organic binder attached to the inorganic fibers, wherein the mat material has an initial compression surface pressure of 900 kPa or more as measured when compressed to a bulk density of 0.50 g/cm.sup.3.

Inorganic coatings that may be used to coat and protect concrete are disclosed. The protective inorganic coatings include a liquid composition portion comprising water, an alkali metal oxide component and a silicate-containing component. The coatings also include a powder composition portion comprising microspheres, metal oxide powder and optional microfibers. When applied to concrete, the coatings provide chemical and physical protection.

Inorganic coatings that may be used to coat and protect concrete are disclosed. The protective inorganic coatings include a liquid composition portion comprising water, an alkali metal oxide component and a silicate-containing component. The coatings also include a powder composition portion comprising microspheres, metal oxide powder and optional microfibers. When applied to concrete, the coatings provide chemical and physical protection.

A composite production method includes impregnating a plate-shaped porous inorganic structure and a fibrous inorganic material with a metal while the fibrous inorganic material is arranged to be adjacent to the porous inorganic structure. In the composite structure, first and second phases are adjacent to each other by using a porous inorganic structure having a porous silicon carbide ceramic sintered body and the fibrous inorganic material, the first phase being a phase in which the porous silicon carbide ceramic sintered body is impregnated with the metal, the second phase being a phase in which the fibrous inorganic material is impregnated with the metal, a percentage of the porous silicon carbide ceramic sintered body in the first phase is 50 to 80 volume percent, and a percentage of the fibrous inorganic material in the second phase is 3 to 20 volume percent. A composite is produced by the method.

A composite production method includes impregnating a plate-shaped porous inorganic structure and a fibrous inorganic material with a metal while the fibrous inorganic material is arranged to be adjacent to the porous inorganic structure. In the composite structure, first and second phases are adjacent to each other by using a porous inorganic structure having a porous silicon carbide ceramic sintered body and the fibrous inorganic material, the first phase being a phase in which the porous silicon carbide ceramic sintered body is impregnated with the metal, the second phase being a phase in which the fibrous inorganic material is impregnated with the metal, a percentage of the porous silicon carbide ceramic sintered body in the first phase is 50 to 80 volume percent, and a percentage of the fibrous inorganic material in the second phase is 3 to 20 volume percent. A composite is produced by the method.

Inorganic coatings that may be used to coat and protect concrete are disclosed. The protective inorganic coatings include a liquid composition portion comprising water, an alkali metal oxide component and a silicate-containing component. The coatings also include a powder composition portion comprising microspheres, metal oxide powder and optional microfibers. When applied to concrete, the coatings provide chemical and physical protection.

Inorganic coatings that may be used to coat and protect concrete are disclosed. The protective inorganic coatings include a liquid composition portion comprising water, an alkali metal oxide component and a silicate-containing component. The coatings also include a powder composition portion comprising microspheres, metal oxide powder and optional microfibers. When applied to concrete, the coatings provide chemical and physical protection.

Sized short alumina-based inorganic oxide fiber comprises, based on the total weight of the sized short alumina-based inorganic oxide fiber: from 0.1 to 15 percent by weight of a size resin comprising a polyamide; and from 85 to 99.9 percent by weight of short alumina-based inorganic oxide fiber. Methods of making the sized short alumina-based inorganic oxide fiber and compositions comprising the sized short alumina-based inorganic oxide fiber in a polymeric matrix are also disclosed.