9902.11.24 - 1,4-Benzenedicarboxylic acid, polymer with 1,4 butanediol and decanedioc acid (CAS No. 28205-74-5) (provided for in subheading 3907.99.50)

This HTS category, 9902.11.24, specifically covers polymers of 1,4-benzenedicarboxylic acid with 1,4-butanediol and decanedioic acid (CAS No. 28205-74-5). These are advanced polyester materials, often engineered for specific industrial applications. The "provided for in subheading 3907.99.50" note indicates that while these polymers fall under the general provisions for other polyesters in Chapter 39, they are subject to the specific temporary legislation and restrictions outlined in Chapter 99. This means their importation may be subject to unique duties, quotas, or other trade measures beyond the standard classification.

Given the context of Section XXII and Chapter 99, this category is distinct from the vast array of goods found in the primary Chapters (01-98) of the Harmonized Tariff Schedule. While sibling categories in Chapter 01, for example, deal with live animals, this HTS code is concerned with specific chemical compounds and their polymeric forms. The focus here is on the chemical composition and manufactured nature of the material, rather than its raw or biological state as seen in many earlier chapters.

As this is a leaf node, there are no further subcategories to explore within 9902.11.24. The classification is highly specific, encompassing only the precisely described polymer. Therefore, any goods imported that do not precisely match the chemical description of 1,4-benzenedicarboxylic acid, polymer with 1,4 butanediol and decanedioic acid (CAS No. 28205-74-5) should not be classified under this provision. Importers must ensure their product’s chemical identity and manufacturing process align exactly with this entry to benefit from or adhere to the temporary legislation it represents.