Molding Process
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PPO Dimensional Stability Application Failure
Problem Phenomenon
PPO precision dimensional parts show dimensional changes under long-term load, assembly accuracy is lost, and customers complain about functional failure.
Cause Analysis
Although PPO has excellent dimensional stability under long-term load, it still creeps beyond the design stress and temperature range; release of molding internal stress changes dimensions; glass fiber reinforcement directionality affects accuracy.
Solution
①Check creep data according to load and temperature conditions; ②low-stress molding to reduce subsequent dimensional changes; ③design with glass fiber direction matching the stress direction; ④long-term dimensional tracking and verification.
Key Takeaway
PPO dimensional stability is a relative advantage, not absolute; design stress and temperature limits must be observed; long-term verification exposes hidden changes.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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