OPTIBENT MF is a rheology additive based on an untreated, natural phyllosilicate. It is particularly suitable for stabilizing free-flowing systems. OPTIBENT MF generates thixotropic flow behavior and is well suited to free-flowing systems with low viscosity hysteresis. It prevents the tendency of aggregates to sediment and bleed, without overly impacting the leveling properties. At high levels, OPTIBENT MF can also reduce the water absorption of mineral binder systems as a result of its morphology. OPTIBENT MF is suitable for a variety of aqueous systems used in certain industries. It is especially recommended for self-leveling screeds and self-leveling underlayments.