If the fabric contains less than 85% polyester staple fibers and is mixed mainly with viscose rayon staple fibers (an artificial staple fiber), it falls under subheading 551511. The key is that viscose rayon is not cotton, so the fabric does not qualify for headings 5513 or 5514. If the polyester content were 85% or more, the fabric would instead go to heading 5512.

An acrylic or modacrylic woven fabric with under 85% acrylic/modacrylic content, mixed mainly with wool or fine animal hair, falls under subheading 551522. If the acrylic content reached 85% or more, it would shift to heading 5512 regardless of the wool component.