A seal for a container

Board for a container for comestibles formed from a sheet coextensive comprising the following layers: a) a plastic top layer; b) an adhesive layer foam / plastic; c) a foam layer; d) an adhesive layer of foam / foil; e) metal foil; f) a layer of heat sealing; wherein the adhesive plastic / foam adheres to the foam plastic layer on at least a portion of their outer surfaces, wherein the adhesive layer of foam / foil adheres to the foam metal over substantially the entire area of ​​the facing surfaces with a bond strength of at least 8N by / 12.5 mM, as measured by a 180 ° peel test described in the present disclosure, having a density measured in the range from 0.6 and 0.95 g ml-1 calculated through the method of density measurement described herein.