Full definition
Abrasive wear subtype caused by very fine particles (< 100 µm) trapped between two surfaces in relative motion, acting as a three-body abrasive. Common in seals, bearings and sliding surfaces of wet grinding equipment. Polyurethane (85–95 Shore A) outperforms natural rubber and steel in this mechanism. Quantified per ASTM G65 (Dry Sand/Rubber Wheel) or ASTM G105 (Wet Sand/Rubber Wheel) test methods.