9902.03.02 - Pyromellitic dianhydride (benzene-1,2:4,5-tetracarboxylic dianhydride) (CAS No. 89-32-7) (provided for in subheading 2917.39.70)

This HTS classification, 9902.03.02, specifically addresses Pyromellitic dianhydride (PMDA), also known as benzene-1,2:4,5-tetracarboxylic dianhydride. This chemical compound, identified by CAS No. 89-32-7, is a crucial intermediate in the production of high-performance polymers, such as polyimides, which are used in electronics, aerospace, and other demanding applications. Its unique chemical structure provides excellent thermal stability, electrical insulation, and mechanical strength to the materials it helps create.

As a temporary or special classification provision within Chapter 99, this code signifies that the usual tariff treatment for this chemical, as outlined in subheading 2917.39.70, may be superseded. This often occurs due to specific trade agreements, temporary legislation, or additional import restrictions enacted under provisions like Section 22 of the Agricultural Adjustment Act. Therefore, while chemically it aligns with other carboxylic acids and anhydrides, its presence in Chapter 99 indicates a unique regulatory or trade status distinct from its primary product classification.

Given that this is a leaf node, there are no further subcategories. Classification under 9902.03.02 is definitive for Pyromellitic dianhydride when specific trade or legislative provisions apply. Importers must carefully consult the accompanying notes and any relevant proclamations or regulations associated with this Chapter 99 provision to ensure full compliance, as it may involve specific quotas, duties, or documentation requirements beyond the standard tariff treatment.