9902.11.48 - Water-dispersible polyisocyanate products based on poly(hexamethylene diisocyanate) (CAS No. 28182-81-2) and dimethyldicyclohexylamine compounds with 3-(cyclohexylamino)-1-propanesulfonic acid-poly(1,6-diisocyanatohexane) (CAS No. 666723-27-9) (provided for in subheading 3911.90.90)

This HTS category, 9902.11.48, specifically covers water-dispersible polyisocyanate products that are formulated with particular chemical compounds. These are polyisocyanate products derived from poly(hexamethylene diisocyanate) (CAS No. 28182-81-2) and dimethyldicyclohexylamine compounds with 3-(cyclohexylamino)-1-propanesulfonic acid-poly(1,6-diisocyanatohexane) (CAS No. 666723-27-9). These specialized products are intended for specific applications, often as components in coatings, adhesives, or other polymer systems where water dispersibility is a key functional requirement. Their unique chemical composition and water-dispersible nature are the defining characteristics for classification under this provision.

As this is a leaf node within Chapter 99, it does not have subcategories. The classification of goods under this specific HTS code is highly detailed, referencing particular CAS numbers and chemical structures to ensure precise identification. Therefore, the distinction from sibling categories lies not in broad product types but in the exact chemical formulation and functional properties of the polyisocyanate product. Goods that do not precisely match the chemical description and CAS numbers specified would need to be classified elsewhere, likely under the provision mentioned in parentheses (subheading 3911.90.90), which pertains to other polymers of Chapter 39.

The purpose of this detailed classification within Chapter 99 is to address specific importations that may be subject to temporary legislation, trade agreement modifications, or section 22 restrictions. Importers must ensure that the goods precisely align with the chemical and functional criteria outlined in the description of 9902.11.48 to benefit from or comply with the provisions associated with this temporary classification. Any deviation in the chemical composition or physical properties could necessitate reclassification under a different HTS code.