The Top Layer Of Laminate Flooring Is Called The “Wear Layer.” This Is The Protective Coating That Keeps Your Floor Free Of Moisture And Stains. Unbiased, Third-Party Testers Perform Each Ac Rating Wear Test On This Layer And Classify Laminate Flooring Into One Of Five Categories, Ac1, Ac2, Ac3, Ac4 & Ac5. During The Test, They Use A Variety Of Techniques And Methods To Intentionally Wear Down The Protective Coating On The Wear Layer And See How Resistant And Durable Each Piece Of Flooring Is To Determine The Laminate Rating. The Higher The Rating, The More Durable The Wear Layer.