The neutralized (potassium salt) form of a phosphate coester of aliphatic alcohols. It imparts improved gloss and color acceptance in waterborne latex paints. Depending on the formulation specifics, Strodex SEK-50D surfactant can also function as a supplemental dispersant to assist in reduction of pigment flocculation. Strodex SEK-50D surfactant does not contain any alkyl phenol ethoxylates (APEOs).