P-PHENYLEN DIAMINE

Description

p-Phenylenediamine (PPD) is an organic compound, a derivative of aniline, primarily used as a dye intermediate and in dyes themselves. It’s a white to purple crystalline solid that darkens upon exposure to air. PPD is also a key component in hair dyes and can be found in some textiles and furs.
Key Characteristics and Uses:
Appearance: White to purple crystalline solid, turning purple or black upon oxidation by air.
Chemical Formula: C6H4(NH2)2.
Uses:
Dye Intermediate: PPD is a crucial component in the production of various dyes, including fur black D and sulfur dyes.
Hair Dye: It is a common ingredient in permanent hair dyes, where it acts as a coloring agent.
Other Applications: PPD can also be found in some textiles, furs, and as a substitute for henna.
Composite Materials: Cosmetic grade PPD is used as a cross-linking/hardening agent in engineering polymers and composites like Kevlar, offering high temperature stability, strength, and chemical/electrical resistance, according to SpecialChem.
Health Considerations:
Toxicity:
PPD is toxic and can be absorbed through the skin, inhaled, or ingested.
Exposure Effects:
Acute exposure can cause severe dermatitis, eye irritation, asthma, and in severe cases, renal failure and coma. Chronic exposure can lead to eczematoid contact dermatitis.
Carcinogenicity:
No information is available on the carcinogenic effects of PPD in humans, according to the US EPA.
Respiratory Issues:
PPD can cause swelling in the upper respiratory tract and larynx, potentially leading to respiratory distress.
Skin Reactions:
Hair dye containing PPD can cause allergic reactions in some individuals, according to ScienceDirect.