For direct processing in a copper converter in Germany, the cartridges must comply with the following specifications:
- Plastic components no more than 3.5%
- Asbestos less than 0.05%
- Cadmium less than 0.005%
These and other residues are bonded in the slag that remains after processing. This slag is formed from the residues of the ceramic cases and the quartz sand and it is reused in road construction. That way, all residual materials are also processed in an environmentally friendly way and rendered harmless so that they will pose no threat in the future.