ASTM D1414 is used to measure the mechanical properties of vulcanized rubber o-rings. Multiple different tests are utilized to determine these properties, such as tension, compression set, low temperature, density, fluid aging, heat aging and hardness. Here we address the tension testing portion of the specification only. In order to perform the tension test, a universal testing machine is required.
Prior to testing, store the o-ring specimens at 23+/-2C for at least 30 minutes.
Load the o-ring onto the ball-bearing spool grips by bringing the grips in close proximity to each other so as not to stretch the sample during loading.
Apply a small preload (<1lbf) to the o-ring. Once the preload force is achieved, zero the position.
Conduct the test by loading the sample at a spool grip separation rate of 20 inches per minute until specimen failure. If a motorized spool grip is used, the spool needs to rotate through one revolution per six inches of travel. For un-motorized grips, lubricate the contact surfaces of the spools with castor oil.