[en] The production of SYNROC on a large scale will require careful control of processing conditions in order to achieve optimum results. One of the problems sometimes encountered is that substantial proportions of the total cesium and molybdenum occurred not in titanate phases such as hollandite, but in minor phases which could be readily leached. This is clearly undesirable and hence a large number of experiments have been carried out in an attempt to elucidate and solve this problem. This report consists of five parts. Part I describes the manner of preparation of SYNROC mixes. In addition to SYNROC, a further mix of hollandite composition containing cesium and molybdenum was also prepared. The concentrations of these elements correspond to the predicted levels in the hollandite phase of a SYNROC formulation with a 10% waste-loading. Part II deals with the first stage of calcination of powdered SYNROC and hollandite mixes, at temperatures of 600 to 1000⁰C under a wide range of redox conditions. In Part III, the implications of the above experiments for the kinetics of formation of SYNROC phases are briefly discussed. Part IV describes the products of hot-pressing the previously calcined mixtures under various redox conditions. Finally, in Part V, conclusions relevant to designing a preferred industrial process are briefly summarized