As in Geometry Mode it is possible to save files in a special format in Materials Mode. In addition to saving materials in the local material database, you can save the materials used in the current simulation in a separate file with the extension *.mat. *.mat files can be opened in Materials Mode only, e.g. for importing materials to new furnaces.
In this file, you save the materials and their properties only, but no information about their assignment to regions. If you want to save this information as well, you have to save the file in Simulation Mode as *.crys file.
If no *.mat file is available, you can open a *.crys file, switch to Material Mode and then save the file again. Opening this *.mat file will transfer the materials and their properties to your current file.
Select File > Save.
or
Select File > Save as...
In the first case, the open file will be saved to a file with the same name, but the extension *.mat. In the 2nd case you can specify a different file name, but the extension will be *.mat as well.