This paper presents the research results on the effect of crushing ceramic extinguishing chambers at different settings of the outlet slot size using a jaw crusher. The influence of the crusher outlet slot size on the crushing process parameters and the grain composition of the resulting product was analyzed, and the range of optimization of each parameter was determined. The problem of using ceramic material waste was solved. The research proved that the jaw crusher works well as a mechanical crushing method for obtaining a fraction of the product that can be used as a feedstock to produce ceramic materials. In this work, novelty crushing plates were used and crushing efficiency indices were obtained for different sizes of closed side setting outlet slots, which may be a contribution to future simulation studies.