Patent ID: 7494556

Claim:
A method for fastening an installation element to the edge of a receiving opening for the installation element in a plate-shaped work surface, wherein the installation element is a sink and has at least one holding element, comprising: arranging a variable-volume material on the installation element and/or on the holding element and/or on the work surface and/or between the installation element and the work surface, wherein the variable-volume material is an expandable material; arranging the installation element in the receiving opening of the work surface; changing the volume of the variable-volume material, so that a clamping body is formed from the variable-volume material, which exerts a resultant force on the holding element of the installation element, which causes the installation element to be pulled towards the work surface, wherein at least a part of the clamping body is arranged between the holding element and the edge of the receiving opening of the work surface and wherein the variable-volume material from which the clamping body is formed is in direct contact with the edge of the receiving opening of the work surface and/or with the holding element, and forms an integral bond with the work surface and/or with the holding element.