Wyzenbeek vs Martindale
Wyzenbeek and Martindale are both abrasion or rub tests that are methods commonly used to predict wear-ability. However, different test applies for each abrasion. Let me start first with the specific meaning of ABRASION.
Abrasion is the ability of a fabric to resist surface wear caused by flat rubbing contact with another fabric.
Test Method :
The Wyzenbeek is a standard test used in the United States. The machine test the fabric in both warp direction (up & down) and the fill of weft (right & left). The number of double rub cycles achieved before the yarn breaks occur is how the rating is determined.
While the Martindale is a European standard. They uses different method when rubbing the fabric which is an oscillating test. Fabric samples are mounted flat and rubbed in a figure eight like motion using a wasted wool cloth as the abradant. The number of cycles that the fabric can endure before the fabric shows insufficient change in shade or appearance. The number of cycles determines abrasion rating.
Both methods are recognized by the American Society of Testing and Materials (ASTM). The way to compare Wyzenbeek and Martindale ratings with a 4:3 ratio.
40,000 Martindale = 30,000 Wyzenbeek
20,000 Martindale = 15,000 Wyzenbeek