Silica Thickener
Additives for coatings
Used to control the viscosity of mixed epoxy systems.
 

Can be used alone for a very smooth, non-sagging, high strength mixture or combined with fillers or fibers to make them non-sagging. 

Silica Fume

"This material is also referred to as colloidal or fumed silica, and is an excellent thixotropic agent" -Retrieved 7/24/2020 from https://www.systemthree.com/products/silica-thickener?_pos=1&_sid=3e3937707&_ss=r

P.O Box 8448
Lacey, WA 98503, USA

available online (see product link)