Para Phenylenediamine

p- Phenylenediamine (PPD) is an organic compound with formula C₆H₄(NH₂)₂ . PPD is an ingredient found in most hair dye and primarily used as a dye intermediate and as a dye. PPD is a derivative of paranitroaniline, and used for dyeing furd, photochemical measurements, accelerating vulcanization and azo-dye manufacturing as well as for oxidizing hair dyes. Chemically, It is an aromatic diamine related to aniline. P-phenylenediamine is one of the simplest aromatic diamine with the pure product being white to purple red crystals.

It turns purple or dark brown color when being exposed to the air. It is slightly soluble in cold water, soluble in alcohol, ether, chloroform and benzene. These chemical can be used for making azo dyes, high-molecule polymers and can also used for the production of fur dyes, rubber antioxidants and photo developer which is mainly used for Kevlar, azo dyes, sulfur dyes, acid dyes as well as being used for the production of black fur D, black fur DB, brown fur N2 and also in rubber antioxidant DNP, DOP and MB. It can also be used as the raw material of cosmetic hair p-phenylenediamine series, gasoline polymerization inhibitor and developer.