Material Analysis
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PA66 temperature resistance selection advantages
Problem Phenomenon
PA6 parts in the engine compartment soften and deform after long-term thermal aging, changing material for the same structure solves it
Cause Analysis
PA66 melting point is 40℃ higher, long-term heat resistance and high-temperature rigidity are significantly better than PA6, and fatigue strength is also better; for high-temperature scenarios such as the engine compartment, PA66 is the default choice
Solution
①Select PA66 for scenarios with long-term working temperature exceeding 120℃; ②Select PA6 for cost-sensitive scenarios below 80℃; ③Check selection against the temperature-life curve; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
The watershed between PA6 and PA66 is temperature; choose 66 for high temperature, choose 6 to save cost at normal temperature, wrong selection cannot be remedied later; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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