Hollow-chamber plate made of plastic with an upper cover layer of extruded plastic material and a lower layer of extruded plastic material and having a plurality of lands (14) between the two cover layers, wherein the webs (14) limiting the hollow chambers (13) of the hollow chamber plate side, wherein on at least a top layer, the webs (14) are formed by formed by forming the extruded plastic web shoulders integrally on the inner side of the cover layer, and wherein the free side edges of the integrally formed web shoulders to the opposite covering layer are firmly bonded in at least one connection zone (11).
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