The invention relates to the field of insulating glass applications, preferably for use in a glass frame with multiple glazing. The glass frame may be used in a sliding door system, such as with a balcony, veranda of terrace. In particular, the invention provides a glass spacer for a glass frame. The invention furthermore provides a glass frame for a sliding glass door. The invention furthermore provides a sliding glass door for a sliding door system. The invention furthermore provides a sliding door system. The invention furthermore also relates to a method for assembling the glass frame, sliding glass door and/or sliding door system.