SATRA STM 129 Fibreboard flexing machine
This is an excellent test for fibreboards such as insole foreparts normally flexed or deformed in wear.
The machine assesses quality and durability by repeated flexing of the specimen through 180°. The machine can also be used to determine the effect of heat on the insole caused by direct-on moulding or vulcanising.
The six 10mm wide test pieces are clamped in the jaws and a 2 kilogram weight is suspended on the lower end. During the test, the jaws are rotated through 180° (90° each side of vertical) until the test piece breaks. Each sample has an individual counter which stops when the sample breaks. This indicates the number of flexes to failure of each test piece.