Definition of 4-(dimethylbutylamino)diphenylamine (6PPD):
4-(dimethylbutylamino)diphenylamine is an aromatic amine and is used in high production volumes
as a protective agent (anti-ozonant and antioxidant) in the rubber industry. The main area of application is
the tyre sector. As such, the main entry pathway of 6PPD to the environment is through tyre abrasion. [1]This is the common definition for 4-(dimethylbutylamino)diphenylamine (6PPD), other definitions can be discussed in the article
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Notes
Although the main area of use of 6PPD is the tyre sector, the chemical is also found in other consumer products, such as seals of pressure cookers. Production in 2001 was estimated at 130.000 tonnes per year of which 25.000 tonnes was produced in Europe (Germany). 6PPD enters the environment mainly from the use and disposal of rubber products, but also in wastewater from manufacturing, cleaning and recycling. From the surface of rubber products, 6PPD might enter rivers through rain and despite its low volatility, it might evaporate to the atmosphere. Until the 1990s tyres were deposited in dumps, which resulted in mass 6PPD leakage. Since then, tyres are increasingly recycled or incinerated, which reduces 6PDD emissions.
