| 摘要 |
<p>A press form for the production of e.g. roof tiles is 2-15 mm thick and has an upper and a lower face. The upper face forms the tile, and the lower non-contact face profile conforms closely with that of the upper face. The press form is a mineral-based element with porous membrane function and is placed in a supporting receptacle during pressing and firing at a temperature of 800 to 2100C. further claimed is a suitable mineral composition for the form.</p> |
