Dovernox D-621 Blend of octadecyl 3,5-di-t-butyl-4-hydroxyhydrocinnamate and tris ( 2,4-di-t-butylphenyl ) phosphite ICC Industries-Dover Antioxidant >> Phosphite Antioxidant >> Phenolic Acrylic/Acrylate Resins Amide Resins Polyurethane Vinyl Coatings >> Powder Coatings Coil Coating Powder coating Blend of phenolic and phosphite antioxidants. Used in paints and coatings. Antioxidants can be added to powder and coil coating formulations to prevent discoloration and loss of physical properties. Dovernox 76: Doverphos S-480 1:2 Blend of phenolic and phosphite antioxidants. Used in powder and coil coating formulations. Prevents discoloration and loss of physical properties.