Xtreme Hard Concrete Densifier
Category: Coatings - multi-surface
Description:

Xtreme Hard is a highly reactive colloidal silica-based densifying agent.

Typical Use:
Can be applied on any concrete surface to achieve a more durable finish that resists spills and wear-damage. 
 
Apparent use of Nanotechnology: colloidal silica
Reason for Inclusion:
"Xtreme Hard Densifier with reactive colloidal silica is a densifier/hardener for concrete, used to improve the performance and appearance of concrete floors...Xtreme Hard Densifier is 99.5% pure silica in nano-scale particles, suspended in an ultra-low surface-tension liquid using a proprietary, “green” manufacturing process." -Retrieved 1/15/2021 from https://xtremeharddensifier.com/sds%2Ftds (see Xtreme Hard Concrete Densifier Technical Data Sheet)
 
Company: Xtreme Hard
Safety Data Sheet (SDS):

available online