Molding Process
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PEI Melting Temperature Range Selection
Problem Phenomenon
PEI melting temperature settings for different applications are confusing; color stability and flowability are difficult to balance, and processes drift between batches.
Cause Analysis
The common melting temperature of PEI is 338~399℃, with most applications in the 357~385℃ range; exceeding 382℃ may cause color change; special grades such as ULTEM ATX should be processed at lower temperatures of 310~371℃; grade differences are significant.
Solution
①Set the melt temperature at 357~385℃ for most applications; ②control color-sensitive applications below 382℃; ③special grades such as ATX follow the 310~371℃ low-temperature range; ④confirm one by one according to the grade manual.
Key Takeaway
PEI melt temperature settings must be grade-differentiated; the 382℃ discoloration line and ATX low-temperature zone are key knowledge points; manual confirmation is better than applying experience.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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