LEAK-PROOF AND UNBREAKABLE PANEL COMPRISING A LOCKING ELEMENT, AND METHOD FOR PRODUCING SUCH A PANEL

The disclosure relates to a panel comprising: a panel body extending in a longitudinal direction and a transverse direction; a retaining groove extending in the transverse direction in an end short side of the panel body; and a locking element which is inserted in the retaining groove substantially immovably, wherein, for an extension bo of the retaining groove in the transverse direction relative to a nominal width B of the panel body between a first edge extending in the longitudinal direction and a second edge of the panel body extending in the longitudinal direction, the following applies: 0.50≤b0/B≤0.97, in particular 0.75≤b0/B≤0.95, preferably 0.85≤B0/B≤0.93 and particularly preferably b0/B=0.90±0.02. An unbreakable and leak-proof panel having good and material-friendly locking is made possible by the retaining groove which extends over only a large portion of the short side and by the locking element immovably received in the retaining groove.