HTS Chapter 56 classifies nonwovens primarily by weight per square meter and whether they are of man-made filaments or staple fibers, rather than by bonding method alone. However, the bonding process (spunbond, needlepunched, hydroentangled, etc.) affects the fabric's physical properties and may influence end-use classification if the nonwoven is further processed into a finished article before import.

Nonwoven fabrics imported as raw material inputs are generally not subject to FDA admissibility review. However, if the nonwoven is already incorporated into a finished medical device or personal protective equipment article, FDA or NIOSH regulatory requirements may apply at entry. Importers should confirm the product's regulatory status — raw material versus finished device — before filing.