This International Standard specifies a method for determining, using a curved (loop-shaped or ring-shaped) stylus, the mar resistance of a single coating of a paint, varnish or related product, or the upper layer of a multicoat system.
EN ISO 12137:2011 history
2011EN ISO 12137:2011 Paints and varnishes - Determination of mar resistance (ISO 12137:2011)