Processing Machinery
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PA66 and PA6 interchange
Problem Phenomenon
Heat resistance test fails after replacing PA66 parts with PA6
Cause Analysis
PA66 melting point 262℃ is about 40℃ higher than PA6, and heat deflection temperature and long-term heat resistance are both superior, direct substitution fails in high-temperature conditions; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience
Solution
Keep PA66 for conditions above 120℃; PA6 can be considered for cost reduction of normal-temperature parts; verify according to maximum working condition before substitution; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
PA6 and PA66 interchange is based on the temperature boundary; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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