any standard polyurethane coatings that tend to post cure at high temperatures e g between 70 u00b0 to 80 u00b0 c because during post cure many urethanes becomes brittle and friable and the resulting powder facilitates abrasion within the rope the test apparatus and test specimen used to evaluate the u2018 bend over sheave u2019 cycle fatigue fatigue life are illustrated in fig2 and 3 test apparatus 20 is shown in fig2 apparatus 20 has a test sheave 22 and a tensioning sheave 24 tension 26 is applied to sheave 24 as shown first test specimen 28 and second test specimen 30 are placed on the sheaves and their free ends are joined together with a coupler 32 test specimen 28 is illustrated in fig3 specimen 28 consists of a rope portion 34 and an eye splice 36 at each end of the rope portion the rope portion includes a double bend zone 38 and two single bend zones 40 located on either side of zone 38 in the results set out below the following parameter were common the tension was 80 kips 80 000 pounds the cycling frequency was 150 cycles per hour cph the nominal stroke was 2130 mm 84 inches the rope was a 40 mm 12 u00d7 12 braided rope with the preferred coating of lago 45 the double bend zone was 1190 mm 3 9 feet and the single bend zone was 945 mm 3 1 feet in table 1 three ropes are compared a.