This subheading covers embroidery where the backing fabric has been chemically or mechanically removed after stitching, leaving only the thread structure—commonly called chemical lace or guipure. If any ground fabric remains visible, the article classifies by fiber content under 581091, 581092, or 581099 instead.

For subheadings 581091–581099, classification follows the fiber composition of the ground fabric, not the embroidery thread. Importers should obtain mill certificates or fiber-content test reports for the base fabric to support the correct subheading declaration.