KOTHEA was recently asked “Do sheer fabrics have a double rub test?”
The Martindale rub test (covered extensively, elsewhere on this site) is an abrasion test. Essentially is mimics sofas being sat on a lot.
Any fabric can be put through the test procedure.
Sheer fabrics are used for curtains and blinds.
So the answer is “No”. Only because sheer fabrics are not used on sofas.
For sheer fabrics or for contract curtains then the most important test is for flame retardancy/flammability.