double rubs:

Plural of double rub.

Abrasion data, commonly found on the tag of commercially produced pieces or on the tag attached to the fabric bolt.
“Double-rub” count is calculated in a test in which a machine repetitively rubs an abrasive pad over a fabric swatch until the material wears out. Each time the machine rubs back and forth over the fabric, it’s called a double-rub. A family room sofa might come with a double-rub rating of between 25,000 and 50,000 double-rubs. A commercial-grade fabric is rated much higher at between 100,000 to 250,000 double-rubs (for example, hotel lobby chairs). Abrasion data can pick most suitable upholstery material for your intended use.

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(image courtesy of our supplier Greenhouse Fabrics)

 

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