Commonly used Fabric durability tests and standards
Pilling is when small fuzzy balls or nibs are formed on the surface of a fabric. This may be a normal part of wear but some fibers and weaves are more prone to pilling. Fabrics made of angora, cashmere, and wool that have short or loose fibers are more likely to pill, as you may already know from having that happen to your favorite sweater.
Historic, Vintage & Reproduction Home Decorating Fabrics -- A Musically & Otherwise Punctuated Glossary of Home Decor Textile Terms
if the Wyzenbeek or Martindale rating is not available?