Molding Process
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PSU Gamma Sterilization Color Change
Problem Phenomenon
【Problem Phenomenon】PSU medical parts show color change after gamma sterilization, while the customer requires maintaining transparency after sterilization
Cause Analysis
Gamma sterilization causes color shift in some materials (PC requires adding purple compensation), PESU maintains transparency under all sterilization methods; PSU's transparency retention is inferior to PESU
Solution
Prefer PESU for gamma-sterilized transparent parts; perform post-sterilization color verification for PSU parts; re-evaluate color stability when the sterilization method changes; after adjustment, continuously sample to verify the effect, confirm stability before resuming mass production
Key Takeaway
Maintaining transparency under gamma sterilization is PESU's strength, PSU parts must have color verified; after confirming effectiveness, fix 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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