Did you follow the instructions on how to create a material library>
Creating a Material Library
A material library is a database containing information about each material. SolidWorks provides a read-only library, SolidWorks Materials, and a library in which you can create custom materials, Custom Materials. You can create additional libraries to store custom materials.
To create a library:
- In a part document, right-click Material in the FeatureManager design tree and select Edit Material.
- In the Material dialog box, right-click any item in the material tree and select New Library.
- In the Save As dialog box, provide a file name in which to store the library. Use a meaningful name. The name you provide becomes the display name for the library. You cannot rename it later.
- Right-click the new library in the material tree, select New Category, and type a name for the category.
You can now copy materials from other libraries in the material tree, paste them into the category, and customize them.
Make sure all of your editors have permissions to the location and that whenever you update your library they get latest.
As Stephen write in his post first you must create this sldmat file that contains your material library. This file can be used (moved) in EPDM.
In EPDM you add or assign a category for this file, make an workflow and give rights for users so on as you made for all files that are managed in EPDM.make a modi
One drawback is that every time you make a modification you must checkout the file. If you use 2014 version, you can check "Refresh cache during login". Using this option all users get the latest version of this file on login.