The role of chemists in Clot del Moro was very important, as they controlled the characteristics of cement which, in fact, is a chemical. To maintain the quality of the product it was necessary to take samples constantly at each stage of the process and analyze them in the laboratory. From the rock coming out of the quarry, through the dosed mixture and the clinker, to the final product. The chemists, once the results were obtained, adjusted the composition of the raw material and the rate and temperature of the rotary kilns.