Chemphos™ TR-421 is a water-soluble surfactant which is exceptionally stable in alkali systems with outstanding compatibility in concentrated electrolyte solutions. It is an effective agent for coupling nonionic surfactants with liquid, alkali detergent systems. Chemphos™ TR-421 exhibits excellent detergency in hard-surface and household cleaners. Moderate foamer. Used in the preparation of dry-cleaning detergents.