Octolite 544 N,N'-Di-beta-naphthyl-p-phenylenediamine Tiarco Chemical Antioxidants >> Amine Rubber - Elastomer (Chloroprene, Butyl …) ADHESIVE N,N'-Di-beta-naphthyl-p-phenylenediamine. Octolite 544 is a 55% anionic aqueous dispersion of DNPD antioxidant and metal deactivator (copper inhibitor). This is a highly active antioxidant which provides good heat and oxidation resistance to SBR, Natural, and other latex systems. DNPD is a very powerful semi-staining antioxidant exhibiting excellent heat resistance. It is also particularly beneficial in protecting against degradation by trace metals such as copper and manganese. Anionic aqueous dispersion of N,N'-Di-beta-naphthyl-p-phenylenediamine. Used as semi-staining antioxidant in adhesives. Provides good heat and oxidation resistance. Protects against degradation by trace metals such as copper and manganese.