The article examines the tasks of mastering, at the first stage, the issue of mechanical strength of products obtained from molten rocks. Concluding the description of the first part of the work, it is necessary to clearly pose the question of what new it brought to the stone foundry industry with its discovery of critical points and what paths are outlined for further successful development of this industry. At the moment, the discovery of critical points T1 and T2 makes it possible to scientifically explain in a completely new light extremely important issues related to the destruction of products during the process of heating and cooling. In addition, such an interpretation of them, being original and extremely timely, can make fundamental changes in the entire technological process of manufacturing castings from molten rocks with a significant restructuring of the thermal regime. It is quite clear that all this, while opening up new prospects in the development of the stone foundry industry, will require additional work on a large scale and not only within the framework of laboratory research alone.
