Certina | Quality testing | Strap colour loss friction test

Several straps are placed on a machine to friction test their finish layer. There is a weight on top of the felt pad pressing down on the watch leather. The aim is to evaluate the colour loss from the leather onto the felt pad after a number of to-and-fro movements. The strap passes the test if the leather itself is unaffected after a particular number of to-and-fro movements. More than one hundred to-and-fro movements are performed for this operation.