ActiVator II is a thermal stabilizer for drilling fluids viscosified with polysaccharide polymers such as natural gums, cellulose derivatives, and biopolymers. ActiVator II is particularly effective in the thermal enhancement of biopolymer-containing fluids, such as xanthan gum.

Besides thermal stabilization, ActiVator II is also designed to buffer the pH of Aphron Fluids in the proper pH range.