Establishing a standardized motor r/min for this test method would greatly improve the overall reproducibility of the test method, as well as the repeatability. This is important because breaks directly correlate to the industry-wide variation in maximum DDPM’s being reported. This is often because the runs that are ‘breaks’ are included in the final reported maximum DDPM, which skews interlaboratory results, and yields a higher DDPM. Users of D2639 are in the position of re-running a sample multiple times simply because of the higher probability that motors with an r/min greater than 300 that come standard on the new plastometer instrumentation will produce a break. Additionally, it is being suggested, as a requirement, that the hysteresis brake torque be checked every 25 runs or more frequently. This could potentially improve interlaboratory results as well.