My parents never felt that I was college 'material'. [=that I was someone who should go to college]
Her boss regards her as executive 'material'. [=as someone who would make a good executive]
The comedian gets his 'material' from things that have happened to him.
(..) We only have a few moments. I'm not going to ask you much. Bologa... The indictment is terrible. Thank God you haven't signed it. I studied all the materials. You will deny everything. You didn't want to desert. You were just lost. I will appeal. We have to hope. For what, Klapka? (..)1965 Forest of the Hanged