Board Thread:Warhammer 40k General Discussion/@comment-25618639-20150625135617/@comment-8464494-20150625154530

Ceramtie is a ceramic coating, kind of like albative armor on a tank. It's designed to absorb some punishment the standard Power Armor itself might not stop. And as stated above, it's likely to break in areas where its "supposed" to break, lessining damage done by impact weapons and so on.