Artificial stonesArtificial stone areEpoxy composed of a matrix and a dispersed phase of hard particles. PolymersPolymers are usually used in their matrix, along with waste from the ornamental stone industry as particulate matter. The properties of polymeric materials are directly influenced by their structure. When used as a matrix for the development of compositeComposite materialsComposite material, it is possible to influence the final properties by controlling the characteristics of the matrix. Thus, the present work aims to study the impactImpact of changing the hardener content on the properties of artificial stonesArtificial stone. The slabs were produced using a vibration and compaction system with vacuum. Fifteen percent of the epoxy resinEpoxy resin was used based on the mass of granite waste. Formulations with 10%, 15%, and 20% hardener were evaluated. The flexural strengthFlexural strength improved with the use of 20%, while the compression strength showed better results with the use of 15%.