Early review of retained process information and machine event log showed no abnormalities in molding process. All critical parameters appear to have been met and were running within the established control limits for the process. Definitive root cause could not be determined from initial review of retained process data alone.
Review of current live process of part number 0308064000 did not give any indicators to cause of the defects. Parts currently running were verified to be setup within the established mold process instructions. Parts tested from the current lot also reveled no indication of brittle hinge or difficulty with closure. Further efforts to replicate this issue by deviating from established process was conducted and validated that changes to processing temperatures (or) mold temperatures would result in degraded (brittle) parts and material. Special instructions were made to highlight importance of mold temperatures on setup documents.