That's good to know. I am aware that CAESAR II doesn't contain all the materials and I have had to add materials myself to the database on a number of occasions. So that is something I know to look for.

It is somewhat disconcerting in this case since the material was covered by the database, but not in the thickness of interest. It would probably be wise in such cases to indicate that in the material description, so the user is aware of the limitation.