Molding Process
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PPO Long-Term Heat Resistance Rating
Problem Phenomenon
[Problem Phenomenon] PPO parts serve at high temperature for a long time, and the temperature rating selection is in doubt
Cause Analysis
Grades such as NORYL SA9000 can reach an RTI of 110°C (230F); different grades have different RTIs, and materials should be selected by comparing the RTI with the long-term working condition temperature
Solution
Select materials for long-term temperature working conditions according to RTI rather than HDT; check the RTI sub-items on the UL Yellow Card; leave a safety margin for working conditions close to the RTI; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
For PPO long-term heat resistance look at RTI, and select 110°C-class grades as needed; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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