(NL1003755-C2)      A sintered plate/substrate for use when heating ceramic products is produced by a method where a top layer of a refractory having a thickness of 0.1-5 mm and 0.1-10 m is introduced onto or into a plate of refractory material having a pore size of 0.1-5 mm. Also claimed is a method of refurbishing a plate as described above by at least partially removing the top layer and applying a new top layer, which is at least 0.1 mm thick and of 0.05-10 m pore size, and mechanically machining the surface. Also claimed is a plate as above which is plane parallel and has the top layer applied to both surfaces.    ADVANTAGE -   The coarse porosity allows for the removal of gases, and the top layer has a dense surface which prevents adhesion and can be machined to maintain dimensional stability and thereafter can be economically refurbished.    (EP958480-A1)      A sintered plate/substrate for use when heating ceramic products is produced by a method where a top layer of a refractory having a thickness of 0.1-5 mm and 0.1-10 m is introduced onto or into a plate of refractory material having a pore size of 0.1-5 mm. Also claimed is a method of refurbishing a plate as described above by at least partially removing the top layer and applying a new top layer, which is at least 0.1 mm thick and of 0.05-10 m pore size, and mechanically machining the surface. Also claimed is a plate as above which is plane parallel and has the top layer applied to both surfaces.    ADVANTAGE -   The coarse porosity allows for the removal of gases, and the top layer has a dense surface which prevents adhesion and can be machined to maintain dimensional stability and thereafter can be economically refurbished.    (EP958480-B1)      A sintered plate/substrate for use when heating ceramic products is produced by a method where a top layer of a refractory having a thickness of 0.1-5 mm and 0.1-10 m is introduced onto or into a plate of refractory material having a pore size of 0.1-5 mm. Also claimed is a method of refurbishing a plate as described above by at least partially removing the top layer and applying a new top layer, which is at least 0.1 mm thick and of 0.05-10 m pore size, and mechanically machining the surface. Also claimed is a plate as above which is plane parallel and has the top layer applied to both surfaces.    ADVANTAGE -   The coarse porosity allows for the removal of gases, and the top layer has a dense surface which prevents adhesion and can be machined to maintain dimensional stability and thereafter can be economically refurbished.