Abstract: A glass fiber-reinforced cement non-plate article which is composed of an inside mortar layer comprising a mixture of normal Portland cement and glass fiber chopped strand, an outside mortar layer comprising a mixture of normal Portland cement and glass fiber chopped strand, and a regulated set cement mortar layer interposed between said both layers and between a pair of continuous glass fiber layers, is formed.

Abstract: This glass fiber-reinforced cement plate is comprised of both outside layers and an intermediate layer interposed therebetween, the former each comprising a glass fiber chopped strand-containing cement layer, the latter comprising a regulated set cement layer.

Abstract: A glass fiber-reinforced cement non-plate article is composed of an inside mortar layer comprising a mixture of normal Portland cement and glass fiber chopped strand, an outside mortar layer comprising a mixture of normal Portland cement and glass fiber chopped strand, and a regulated set cement mortar layer interposed between said both layers by the aid of a continuous glass fiber layer.

Abstract: This glass fiber-reinforced cement plate is comprised of both outside layers and an intermediate layer interposed therebetween, the former each comprising a glass fiber chopped strand-containing cement layer, the latter comprising a regulated set cement layer.

Abstract: This glass fiber-reinforced cement plate is comprised of both outside layers and an intermediate layer interposed therebetween, the former each comprising a glass fiber chopped strand-containing cement layer, the latter comprising a regulated set cement layer.

Abstract: A tuyere for a melting furnace, which comprises inner and outer walls forming a water cooling space therebetween; a cylindrical intermediate wall dividing the water cooling space into an inner water cooling chamber and an outer water cooling chamber, whereby the cooling water is first introduced into the outer water cooling chamber from the outside of the furnace, circulated into the inner water cooling chamber from the inner end portion at the furnace side of the outer water cooling chamber and thereafter discharged from the outer end portion of the inner water cooling chamber; and a guide wall disposed in the outer water cooling chamber so as to form a helical passage for the cooling water, said helical passage being so devised that a portion of the passage located so as to be subjected to a relatively high heat load has a cross-sectional area smaller than that of other portions of the same.