When you work with the material grades, note the usage of the following buttons in the Modify Material Catalog dialog box:
Saves the changes of a single edited material grade to the computer’s memory until you click OK.
Saves the changes in the model folder.
Tekla Structures saves the modified catalog on the hard disk when you click OK to close the dialog box and then click OK in the Save confirmation dialog box.
Closes the Modify Material Catalog dialog box without saving the changes.
Note that all changes made to the catalog will be lost even if you have clicked Update , because the changes have not been saved on the hard disk. The changes made to the catalog are visible during one session, because the catalog is using the computer’s memory. When you start Tekla Structures the next time, the previous data is restored from the hard disk.
Tekla Structures stores the material information in the matdb.bin file. When you first open a model, Tekla Structures reads the data from the hard disk and stores it in the computer’s memory.
When you select a material, Tekla Structures reads the data from the computer’s memory and displays it in the Modify Material Catalog dialog box. This is faster than accessing the data from the hard disk.