Corner block for glass furnace

A glass furnace comprising a tank comprising a side wall comprising a corner block, said corner block having an outer surface comprising:

• upper and lower surfaces delimiting the length of the corner block,
• right and left surfaces in contact, in the operational position, with corresponding surfaces of adjacent blocks,
• a hot face intended to be in contact, in the operational position, with the environment inside said tank, said hot face being separated of said right and left surfaces by hot face right and left boundaries, respectively,
• a cold face, opposite the hot face,
• the corner block being characterized in that in a main portion of the corner block extending, over more than 80% of the length of the corner block, between two limiting upper and lower transverse planes, the surface of the hot face extending between said hot face right and left boundaries is edge-free,
• an edge being a line along which the hot face has a break in slope greater than 25°, the hot face having a profile that is convex in any transverse sectional plane in the main portion, at least a part of said profile being strictly convex.