Amino-resins not captured by the melamine or urea/thiourea headings — such as benzoguanamine-formaldehyde or glycoluril-based resins — are classified here as a residual NES category. These specialty resins serve niche roles in coatings crosslinkers, textile finishing agents, and paper wet-strength applications where standard MF or UF chemistry is insufficient. Because the NES designation requires affirmative exclusion from the named amino-resin types, importers should retain detailed polymer characterization data to defend classification during CBP review.

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