Material Analysis
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PEI High-Temperature Mechanical Property Decay
Problem Phenomenon
The strength of PEI products gradually decays during use in high-temperature environments, and the performance retention rate above 180℃ is lower than expected.
Cause Analysis
PEI can still retain good mechanical properties at 180℃, but long-term high-temperature aging accumulates; the actual working condition temperature exceeds the continuous use temperature range of 150~170℃; thermo-oxidative aging is irreversible.
Solution
①Select materials according to the 150~170℃ continuous use temperature with a margin; ②short-term 180~200℃ does not cause damage but cannot be long-term; ③verify life with accelerated aging; ④regular replacement plan for high-temperature parts.
Key Takeaway
PEI high-temperature performance must distinguish between continuous and short-term tolerance; 150~170℃ is the design benchmark; aging data guides maintenance plans.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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