SMAX is Sericite Mica coated with synthetic paraffin wax. The advantage of this surface treatment is that the mica has a nice silky feeling going on and it also stays on longer! (improved slip and adhesion). By using a synthetic rather than a natural wax, the melting point is higher, making for a product which is more stable under all conditions.
The wax surface coating also gives it a better "pressability" making it a superior choice for pressed powder cosmetics.
The following reviews are from our old website, and predate 2015. Items were ranked from 1 - 5.
I like Smax more so than the other fillers/additives especially during winter when my skin is really dry. The next runner up would be the Cmax.