*2.1. Materials*

Materials commonly used for sheet-metal components such as aluminium alloy, copper alloy and hot-dipped galvanized steel were tested. These materials are used in the form of thin sheets on construction sites; however, this research required the production of solid circular plates (hereinafter referred to as targets) and strips to be bonded to the substrate. The metallic materials used were aluminium alloy EN AW-2011 according to the EN 573-3 standard [8] with a tensile strength of 295.0 MPa and a yield strength of 195.0 MPa, copper alloy CW004A-R250—SH (Cu-ETP) according to the EN 13,601 standard [9] with a tensile strength of 250.0 MPa and a yield strength of 200.0 MPa, and hot-dipped galvanized steel brand S235JR (1.0038) according to the EN 10025-2 standard [10] with a tensile strength of min. 360.0 MPa and a yield strength of 235.0 MPa. The thixotropic silane modified polymer adhesive ARDEX CA 20 P for external applications produced by Ardex Baustoff GmbH was chosen for bonding to the substrate. No mechanical properties were provided by the manufacturer. The following materials were used for the production of the solid plasterboard test specimens for bonding the metal tear-off elements:

