Scott Tensile Tester

Stress-Strain Values Polyurethane stress-strain properties were measured with the Scott Tensile Tester operated at a jaw separation rate of 20 inches per minute. Test pieces were microdumbbells died out of 25 mil thick compression-molded sheets. The test pieces were pre-conditioned for 24 hours at 50% relative humidity and 25°C, and then tested in this environment. 

The method of Scott and Robbins [123] involves attaching the root end of a hair hber to the load cell of an Instron tensile tester. The hber is weighted at the tip end and partially wrapped around two mandrels (these may be rotated) but more relevant results are obtained when the mandrels are not rotated. The mandrels are attached to the crosshead, and as they move downward against the hber, the frictional tension is recorded. 

The fiber-capstan method involves draping or wrapping a weighted fiber over or around a reference rod as a means of increasing the contact area. In the method described by Scott and Robbins (40), the root end of the fiber is attached to the load cell of the Instron Tensile Tester the fiber is then partially wrapped around two mandrels (one of which can be rotated) mounted on the Instron crosshead, as shown in Figure 18. A load of 1 g is attached to the tip end of the fiber. A similar version with a nomotating mandrel is used at TRl, where the capstans are mounted on the Instron crosshead and can be... 

One-half sized ASTM dumbbells of rubber ( <85 mils thick) were aged in a forced draft air oven. Their tensile properties were measured on a Model LACC Scott Tester, at 20 inches/min. Compression set tests were made on buttons 0.5 inch thick and 0.75 inch in diameter. They were compressed 25%, according to ASTM D-395 method B. 

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