Saving the Material Library
In the Material Export group select Create () to export the material properties to a new material library. In the Save Material Library window specify the filename and location. Click OK to export.
In the Material Export group select Append () to export the material properties to an existing material library. In the Append Material Library window select an existing material library, and click OK to export.
COMSOL automatically finds and imports material libraries saved in the materials folder of the COMSOL preferences directory. This is set as the default location when you create new material libraries or when you append data to existing material libraries.