Plastic breaking board of the alarm device and the method for manufacturing the alarm device and the breaking board

A break pane 3 of plastics material for an alarm call point device 1 with at least two sub-regions 6, 7 and with at least one predetermined separating point 8, 9, 10 is disclosed. The predetermined separating point 8, 9, 10 extends at least in portions between the at least two sub-regions 6, 7. The predetermined separating point 6, 7 is formed so that the at least two sub-regions 6, 7 are separated from one another upon application of a predetermined force, such that the predetermined separating point 8, 9, 10 is formed so as to be only irreversibly separable. Also disclosed is an alarm call point housing comprising a break pane in which the break pane can be inserted into the closed call point housing from the outside and a method of forming a break pane comprising two different regions,each of a different material, wherein the two different regions are joined in a common injection mould.