Tixogel MP 250 Organoclay Sud Chemie Rheology Modifiers / Thickeners >> Organoclay SEALANT Additives for Caulks and Sealants Tixogel® MP250 Maximum Performance compared to V2, offers improved performance in very high polarity systems. Requires activation. May be post-added under moderate shear. Very good performance organoclay. Used as a rheology modifier for caulks and sealants. Offers improved performance in very high polarity systems. Requires activation. May be post-added under moderate shear.