### 27.1.1. Library Materials

CFX-Pre provides an extensive list of library materials. Properties for these have already been defined and are known to CFX-Pre. If you modify a library material during a simulation using the Material details view, the modified definition is stored in the simulation file and is therefore local to your simulation.

On the Outline tab, right-click `Materials` and select Import Library Data to open the Select Library Data to Import dialog box. From here, you can select a material to load.

If necessary, you can open the File to Import dialog box by clicking Browse . The dialog box will open with the default location: `<CFXROOT>/etc/materials-extra/`. This directory contains CCL files that can be used to load additional materials into CFX-Pre (for example, Redlich Kwong, IAPWS, or Interphase Mass Transfer materials).

After importing material(s) from a library, you should inspect the material property data to ensure that it is adequate for the specific application.

If you want to use a material defined in one simulation in another simulation, the recommended method is to use the Export and Import CCL features to load the material definition from a local file. This is done by exporting CCL objects of type `LIBRARY:LIBRARY/MATERIAL`. For details, see Import CCL Command and Export CCL Command.

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