In Todd Helme`s write up of FG400 vs M105, it looked as if FG featured clumps of SMAT abrasives, that "diminished" into true SMAT. I believe the term is agglomorated abrasives.
I also believe that Rupes Zephir is oriented similarly, as per an AGO forum member`s posting.
http://www.autopia.org/forums/detai...nd-vs-menzerna-fg400-fast-gloss-compound.html
It has to contain smat since Todd Helme used water to improve its working time, just like KBM on Megs smat abrasives.