Paradiaminobenzene

Paradiaminobenzene, also known as p-phenylenediamine or PPD, is an organic compound with the chemical formula C6H4(NH2)2. It is a derivative of benzene, with two amino groups attached at opposite positions on the benzene ring (para positions). PPD typically appears as white to light-colored crystals or flakes that darken upon exposure to air and light due to oxidation. It is soluble in water, ethanol, and ether.

This compound is widely used in various industrial applications. A significant use is as a precursor in the synthesis of polymers, particularly high-performance materials like aramids, which are known for their strength and heat resistance. It is also employed in the production of dyes, especially for hair coloring, and as an antioxidant in rubber and certain plastics. In photography, it has found use as a developing agent.

While valuable in industry, paradiaminobenzene is also known for its allergenic potential. Skin contact can lead to allergic contact dermatitis in sensitized individuals, characterized by redness, itching, and swelling. Due to these health concerns, its use in some consumer products is regulated, and warnings are often required. Safe handling practices are essential when working with this chemical.