Abrasion Resistance (Ac Rating) : Also referred to as the wear rating, it is the European Standard AC Rating. The range runs from the least resistant rating of AC1 To AC5, the most resistant to abrasion
Complete Design, Inc. (Construction Design Specialists), Dictionary of Construction Terminology, Washington, USA 2015. http://completedesign.cc/client-resources/dictiona ry-of-construction-terminology, (Const - Amer) {836}