HSN Code : 29215130 Synonyms : 1,4-Diaminobenzene, 1,4-Phenylene Diamine CAS No. : 106-50-3 Molecular Formula : C6H8N2 Application : p-Phenylenediamine is an organic compound with the formula Câ??Hâ??(NHâ??)â??. This derivative of aniline is a white solid, but samples can darken due to air oxidation. It is mainly used as a component of engineering polymers and composites like kevlar. An intermediate used in the synthesis of engineering polymers, para-aramid fibers, polyimides, hair dyes, rubber chemicals, textile dyes and pigments. p-PDA is selected for the outstanding properties it imparts, including high temperature stability, high strength and chemical and electrical resistance. PPD is widely used as permanent hair dyes solution (oxidative dyes) and dye intermediate, vulcanization accelerator, in textile, photo copy and printing inks, lithography plates and photographic developments. It is an allergic chemical so must be used carefully. Being as an antiozonants, Para Phenylenediamine is used in rubber production and as a precursor to polymers.