Tixogel MPZ Organoclay Sud Chemie Rheology Modifiers / Thickeners >> Organoclay SEALANT Additives for Caulks and Sealants Tixogel® MPZ Maximum Performance organoclay for aromatic, oxygenated, epoxy systems. Requires polar activation. Very good performance organoclay. Used as a rheology modifier for caulks and sealants. Designed for aromatic, oxygenated, epoxy systems. Requires polar activation.