Abstract: A method of producing decorative cellular ceramic building materials in a single firing process from SiO.sub.2 -containing starting materials is disclosed according to which method at least the bottom of a refractory mold is covered with a first layer of a glass material or a glass forming composition which does not expand when heated and which has a melting point of 800.degree.-1200.degree. C., whereafter the SiO.sub.2 -containing starting material used for producing the cellular ceramic is applied in the form of a second layer on the first layer in the mold, whereafter the mold and its contents are heated to 800.degree.-1000.degree. C. for a period of time of such duration that the ceramic starting material and the glass material sinter together and the ceramic starting material obtains a porous structure.

Abstract: The present invention involves a method of making foamed ceramic building elements by coating the bottom of a mould with a layer of uncolored glass material, applying a layer of colored glazing material over said layer of uncolored glass material and charging an expandable mass to the mould over said layer of glazing material.

Abstract: The present invention is concerned with a method for the manufacture of objects having two shaped surfaces from setting material such as cement and gypsum mixtures. In this method a discrete quantity of the setting material is applied to a mold portion having a surface corresponding to one of the shaped surfaces of the object and is permitted to set therein. The improvement of the invention comprises the application of a discrete quantity of the setting material also to a mold portion having a surface corresponding to the second shaped surface of the desired object. The two mold portions are then brought together to form a mold while the setting material contained therein is still shapable. Hereby the quantities of shapable material are pressed against each other to form the desired object. The latter is then separated from the mold portions.

Abstract: A method for the production of foam ceramics or shaped articles of foam ceramics from an aqueous starting mixture containing components which on heating to a temperature between 700.degree. and 1100.degree.C form a viscous, sintered and porous mass, which comprises incorporating a hydraulic binder or latent hydraulic binder into the aqueous starting mixture to effect solidification of the latter.