3812.39.20.00 - Mixtures of N,N'-diaryl-p-phenylenediamines

This HTS category, 3812.39.20.00, specifically classifies mixtures containing N,N'-diaryl-p-phenylenediamines. These compounds are primarily utilized as antioxidants and stabilizers in various industrial applications, most notably within the rubber and plastics industries. Their chemical structure makes them effective in preventing degradation caused by oxidation, thereby extending the lifespan and maintaining the performance characteristics of the materials they are incorporated into.

This classification is distinguished from its sibling category, 3812.39.30.00, which covers specific master batches of complex chemical compounds, including those based on benzotriazole derivatives and polyurethanes. While both fall under "Other" stabilizers containing aromatic or modified aromatic components, 3812.39.20.00 is reserved for mixtures where N,N'-diaryl-p-phenylenediamines are the key stabilizing agents, as opposed to the pre-formulated master batches detailed in the sibling.

As this is a leaf node within the HTS structure, there are no further subcategories. Therefore, classification within 3812.39.20.00 relies on the definitive presence of N,N'-diaryl-p-phenylenediamines as a significant component of the mixture intended for use as an antioxidant or stabilizer. Examples might include pre-mixed antioxidant formulations where these diamines are blended with other inert carriers or additives to facilitate their incorporation into rubber or plastic compounds.