Tensile results arrive too late to explain what went wrong. Parker Hannifin’s Materials Engineering team used the Premier RPA to evaluate filler dispersion at the mixing stage, before cure could bury the evidence.
Download “Using Premier RPA to Interpret Mixing Quality in Hose Compounds”: the method, data and interpretation from Parker’s study.
RPA before cure, tensile after
evaluated in the study
Materials Engineering case study
Tensile strength is the industry standard, but it only tells you what happened after cure. It confirms pass or fail. It doesn’t explain why.
When a batch drifts out of spec, you’re left guessing. Was it mixing? Raw material variation? Something during cure? Tensile results alone won’t tell you.
Parker’s team didn’t wait for cured parts to reveal problems. They tested uncured compounds with RPA strain sweeps to measure filler network development at the mixing stage, then ran tensile strength distributions on cured samples to confirm macro-scale dispersion.
This separated mixing effects from cure effects and gave the team confidence in the root cause before production.
RPA strain sweeps quantify filler network integrity through the Payne effect, giving you a mixing-sensitive fingerprint independent of cure behavior.
By comparing uncured and cured Payne effect values, the study shows which dispersion characteristics come from mixing and which develop during cure.
RPA strain sweeps revealed which mixing approach produced the best dispersion before cure, without relying on cure-dependent properties.
Testing compound quality before production saves time, prevents scrap and protects your bottom line. Waiting for tensile on cured parts means the problem has already happened.
Parker’s approach combines early warning from the RPA with final confirmation from tensile. Together, these two tests tell you what you need to know about your compound’s dispersion and mixing quality.
This reprint focuses on a sulfur-cured chloroprene hose cover compound with high filler loading. Three mixing strategies (CR1, CR2 and CR3) were evaluated using RPA strain sweeps and tensile strength distributions.
Get the method, data and interpretation from Parker’s study, built for engineers and quality teams who need answers before cure. Prepared from a special report originally published in Rubber News (March 31, 2025) and reproduced with permission.
