Para-phenylenediamine (PPD)
Other names: p-Phenylenediamine, 1,4-phenylenediamine, benzene-1,4-diamine, para-phenylenediamine, paraphenylenediamine, p-phenylenediamine
Harm score: 4 (Slightly harmful chemistry)
Para-phenylenediamine (PPD) is an organic compound that is characterized by high dyeing efficiency and is therefore widely used in the cosmetic industry. Other names for this chemical element are p-Phenylenediamine, 1,4-phenylenediamine, benzene-1,4-diamine, para-phenylenediamine, Paraphenylenediamine and p-phenylenediamine. This substance is dark brown to black in colour and is solid under normal conditions. It has strong reducing properties and is very soluble in water and alcohol.
PPD is mainly used in the cosmetic industry in the production of permanent black and dark hair dyes, where it serves as the primary colouring agent. In addition, it is also widely used in the production of textile and leather dyes due to its excellent dyeing properties. However, para-phenylenediamine is still a controversial ingredient in the cosmetics market. Its use can cause allergic reactions in some individuals. Its potential carcinogenicity has also been reported in some studies. Outside the cosmetics industry, PPD is also used in the rubber industry and in the production of resins.