Spacer for layer insulation systems of metal foils

摘要

The spacer is formed of a pasty mass of water glass base which is applied on a foil. In an increased temperature, the pasty mass froths into a firm, foamed material. A hardener and/or thickener is added to the water glass. Aluminium hydroxide or an aluminium phosphate is used as water glass hardener, and precipitating silicic acid or pyrogenic silicic acid is used as thickener. The temperature for frothing the mass lies between 100 and 200 degrees C.