It is also important that the core-boxes must have a solid structure, as well as patterns.
Core-boxes are designed in a solid construction, which is determined according to its size and filling method, Sheet metal, aluminium or araldite materials can be used at the specific locations of the wooden core-boxes, where it needs to be more resistible.
Lifting and tightening apparatus are mounted to the core-boxes, before the delivery to the foundries, in order to be used by the foundrymen easily.