This method utilises a standard eyelet mounted on a rigid board and the lace to be tested. Laces should be stored in a standard controlled atmosphere for at least 48 hours before testing.
The equipment has six stations for testing laces. Eyelets affixed to rigid boards are placed in the holders provided. One end of the lace to be tested is clamped in a carrier and the other end is passed through the eyelet and then fixed to a weight capable of applying a tensioning force of 4.46N to the lace. The machine moves each lace a distance of 75mm through the eyelet at 100 cycles per minute. The movement of the carrier causes the lace to rub in the eyelet. Each station has a separate counter and, when a lace breaks, the count is stopped on that station. When all six laces have broken, the machine will stop.
STM 152 is provided with hand control for ease of setting and is fully guarded to comply with European Health and Safety requirements. This machine can be used to test eyelets against standard shoelaces or alternatively shoelaces against standard eyelets.