Doverphos 49 Tris (tridecyl) phosphite ICC Industries-Dover Antioxidant >> Phosphite Coatings >> Powder Coatings Coil Coating Powder coating Tris (tridecyl) phosphite. Used as an antioxidant in paints and coatings. Antioxidants can be added to powder and coil coating formulations to prevent discoloration and loss of physical properties. Tris (tridecyl) phosphite. Used as an antioxidant in powder and coil coating formulations. Prevents discoloration and loss of physical properties.